🕷️ Crawler Inspector

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Direct Parameter Lookup

Raw Queries and Responses

1. Shard Calculation

Query:

Response:

Calculated Shard: 14 (from laksa042)

2. Crawled Status Check

Query:

curl -X POST \
  'http://laksa014.int.ahrefs:8124/' \
  -H 'Content-Type: text/plain' \
  -H 'X-ClickHouse-Database: crawler3' \
  -H 'Authorization: Basic YXBpOg==' \
  -d 'SELECT getAhrefsURLFromUnparsed(src_unparsed) AS found_url, ifNull(toUnixTimestamp(download_stamp), 0) AS crawl_time, ifNull(toUnixTimestamp(props_url_first_seen), 0) AS first_indexed_time, download_http_code AS http_code, src_unparsed AS src_unparsed, src_root_hash AS src_root_hash, history_drop_reason AS history_drop_reason, meta_title AS meta_title, meta_descriptions AS meta_descriptions, attrs_boilerpipe_text AS attrs_boilerpipe_text, attrs_markdown AS attrs_markdown, attrs_readable_markdown AS attrs_readable_markdown, meta_canonical AS meta_canonical FROM crawler3.page_info_local FINAL PREWHERE (src_root_hash, src_unparsed) IN ((getAhrefsRootHashFromUnparsed(getAhrefsUnparsedNoserviceFromURL(\'https://www.redhat.com/en/blog/tips-using-screen\')), getAhrefsUnparsedNoserviceFromURL(\'https://www.redhat.com/en/blog/tips-using-screen\'))) FORMAT JSONEachRow'

Response:

{"found_url":"https:\/\/www.redhat.com\/en\/blog\/tips-using-screen","crawl_time":1772265433,"first_indexed_time":1732099691,"http_code":200,"src_unparsed":"com,redhat!www,\/en\/blog\/tips-using-screen s443","src_root_hash":"4780968593380432814","history_drop_reason":null,"meta_title":"Tips for using screen","meta_descriptions":["What happens when you’re connected to a remote system, using a long-running program, and then the connection drops? The odds are, at a minimum, you’re go..."],"attrs_boilerpipe_text":"What happens when you’re connected to a remote system, using a long-running program, and then the connection drops? The odds are, at a minimum, you’re going to have to restart the program, and in a worst-case scenario, you’ll have data corruption. To help get around this, some programs run in a window shell on the system. A very basic example of this is the\nscreen\nprogram:\n[pgervase@pgervase ~]$ ssh root@rhel7dev.usersys.redhat.com\nX11 forwarding request failed on channel 0\nLast login: Wed Jan 27 12:10:06 2021 from xxxxxxxx.redhat.com\n\n[root@rhel7dev ~]# screen\nThis opens my new shell on the\nrhel7dev\nsystem. I’ll run the\nping\ncommand below from inside of that session:\n[root@rhel7dev ~]# ping www.google.com\nPING www.google.com (74.125.24.147) 56(84) bytes of data.\n64 bytes from 74.125.24.147 (74.125.24.147): icmp_seq=1 ttl=100 time=242 ms\n64 bytes from 74.125.24.147 (74.125.24.147): icmp_seq=2 ttl=100 time=242 ms\n64 bytes from 74.125.24.147 (74.125.24.147): icmp_seq=3 ttl=100 time=242 ms\nI’ll now demonstrate how to detach from the session to simulate a network outage or to simply leave something running overnight. To do this, I hit\nCtrl\n, hold that key down, then hit\nA\n, then hit\nD\n. That brings me back to the default SSH prompt and I am then able to run\nscreen -ls\nto see my detached session:\n[root@rhel7dev ~]# screen -x\n[detached from 25665.pts-0.rhel7dev]\n[root@rhel7dev ~]# screen -ls\nThere is a screen on:\n    25665.pts-0.rhel7dev    (Detached)\n1 Socket in \/var\/run\/screen\/S-root.\n\n[root@rhel7dev ~]#\n[ You might also enjoy: \nWorking with pipes on the Linux command line\n]\nTo resume my screen session, I type\nscreen -x\nbecause there was only one session as an option. That brought me back to the screen session where the\nping\ncommand is still running:\n[root@rhel7dev ~]# ping www.google.com\nPING www.google.com (74.125.24.147) 56(84) bytes of data.\n64 bytes from 74.125.24.147 (74.125.24.147): icmp_seq=1 ttl=100 time=242 ms\n64 bytes from 74.125.24.147 (74.125.24.147): icmp_seq=2 ttl=100 time=242 ms\n<snipped>\n64 bytes from 74.125.24.147 (74.125.24.147): icmp_seq=19 ttl=100 time=242 ms\n64 bytes from 74.125.24.147 (74.125.24.147): icmp_seq=20 ttl=100 time=242 ms\n^C\n--- www.google.com ping statistics ---\n20 packets transmitted, 20 received, 0% packet loss, time 20278ms\nrtt min\/avg\/max\/mdev = 242.105\/242.197\/242.727\/0.576 ms\n[root@rhel7dev ~]#\nI can have multiple screen sessions at once:\n[root@rhel7dev ~]# screen -ls\nThere is a screen on:\n    25665.pts-0.rhel7dev    (Detached)\n1 Socket in \/var\/run\/screen\/S-root.\n\n[root@rhel7dev ~]# screen\n[detached from 25693.pts-0.rhel7dev]\n[root@rhel7dev ~]# screen -ls\nThere are screens on:\n    25693.pts-0.rhel7dev    (Detached)\n    25665.pts-0.rhel7dev    (Detached)\n2 Sockets in \/var\/run\/screen\/S-root.\n\n[root@rhel7dev ~]# screen\n[detached from 25706.pts-0.rhel7dev]\n[root@rhel7dev ~]# screen -ls\nThere are screens on:\n    25706.pts-0.rhel7dev    (Detached)\n    25693.pts-0.rhel7dev    (Detached)\n    25665.pts-0.rhel7dev    (Detached)\n3 Sockets in \/var\/run\/screen\/S-root.\n\n[root@rhel7dev ~]#\nIn each of those three screen sessions, I can have commands running or simply leave a session sitting at the prompt.\nA default\nscreen -x\nwill not work to resume a session now because of the multiple screens running:\n[root@rhel7dev ~]# screen -x\nThere are several suitable screens on:\n    25706.pts-0.rhel7dev    (Detached)\n    25693.pts-0.rhel7dev    (Detached)\n    25665.pts-0.rhel7dev    (Detached)\nType \"screen [-d] -r [pid.]tty.host\" to resume one of them.\n\n[root@rhel7dev ~]#\nTo attach to one of my sessions, I need to run\nscreen -x\nand add enough of the screen name to be unique:\n[root@rhel7dev ~]# screen -x 257\n[detached from 25706.pts-0.rhel7dev]\n\n[root@rhel7dev ~]#\nRather than trying to limit yourself to just one session or remembering what is running on which screen, you can set a name for the session by using the\n-S\nargument:\n[root@rhel7dev ~]# screen -S \"db upgrade\"\n[detached from 25778.db upgrade]\n\n[root@rhel7dev ~]# screen -ls\nThere are screens on:\n    25778.db upgrade    (Detached)\n    25706.pts-0.rhel7dev    (Detached)\n    25693.pts-0.rhel7dev    (Detached)\n    25665.pts-0.rhel7dev    (Detached)\n4 Sockets in \/var\/run\/screen\/S-root.\n\n[root@rhel7dev ~]# screen -x \"db upgrade\"\n[detached from 25778.db upgrade]\n\n[root@rhel7dev ~]#\nTo exit a screen session, you can type\nexit\nor hit\nCtrl+A\nand then\nD\n.\nNow that you know how to start, stop, and label\nscreen\nsessions let's get a little more in-depth. To split your screen session in half vertically hit\nCtrl+A\nand then the\n|\nkey (\nShift+Backslash\n). At this point, you’ll have your screen session with the prompt on the left:\nTo switch to your screen on the right, hit\nCtrl+A\nand then the\nTab\nkey. Your cursor is now in the right session, but there’s no prompt. To get a prompt hit\nCtrl+A\nand then\nC\n. I can do this multiple times to get multiple vertical splits to the screen:\nYou can now toggle back and forth between the two screen panes by using\nCtrl+A+Tab\n.\nWhat happens when you\ncat\nout a file that’s larger than your console can display and so some content scrolls past? To scroll back in the buffer, hit\nCtrl+A\nand then\nEsc\n. You’ll now be able to use the cursor keys to move around the screen and go back in the buffer.\nThere are other options for\nscreen\n, so to see them, hit\nCtrl\n, then\nA\n, then the\nquestion mark\n:\n[ Free online course:\nRed Hat Enterprise Linux technical overview\n. ] \nFurther reading can be found in the man page for\nscreen\n. This article is a quick introduction to using the\nscreen\ncommand so that a disconnected remote session does not end up killing a process accidentally. Another program that is similar to\nscreen\nis\ntmux\nand you can read about\ntmux\nin\nthis article\n.","attrs_markdown":"[Skip to content](https:\/\/www.redhat.com\/en\/blog\/tips-using-screen#rhdc-main-content)\n\n## Navigation\nMenu\n\nAI\n\n- ### Our approach\n  - [News and insights](https:\/\/www.redhat.com\/en\/blog\/channel\/artificial-intelligence)\n  - [Technical blog](https:\/\/developers.redhat.com\/aiml#ai-ml-main-tab-recent-articles-100491)\n  - [Research](https:\/\/www.redhat.com\/en\/artificial-intelligence\/research)\n  - [Live AI events](https:\/\/www.redhat.com\/en\/events\/ai)\n  - [Get an overview](https:\/\/www.redhat.com\/en\/artificial-intelligence)\n\n- ### Products\n  - [Red Hat AI Enterprise](https:\/\/www.redhat.com\/en\/products\/ai\/enterprise)\n  - [Red Hat AI Inference Server](https:\/\/www.redhat.com\/en\/products\/ai\/inference-server)\n  - [Red Hat Enterprise Linux AI](https:\/\/www.redhat.com\/en\/products\/ai\/enterprise-linux-ai)\n  - [Red Hat OpenShift AI](https:\/\/www.redhat.com\/en\/products\/ai\/openshift-ai)\n  - 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The odds are, at a minimum, you’re going to have to restart the program, and in a worst-case scenario, you’ll have data corruption. To help get around this, some programs run in a window shell on the system. A very basic example of this is the `screen` program:\n```\n[pgervase@pgervase ~]$ ssh root@rhel7dev.usersys.redhat.com\nX11 forwarding request failed on channel 0\nLast login: Wed Jan 27 12:10:06 2021 from xxxxxxxx.redhat.com\n\n[root@rhel7dev ~]# screen\n```\nThis opens my new shell on the `rhel7dev` system. I’ll run the `ping` command below from inside of that session:\n```\n[root@rhel7dev ~]# ping www.google.com\nPING www.google.com (74.125.24.147) 56(84) bytes of data.\n64 bytes from 74.125.24.147 (74.125.24.147): icmp_seq=1 ttl=100 time=242 ms\n64 bytes from 74.125.24.147 (74.125.24.147): icmp_seq=2 ttl=100 time=242 ms\n64 bytes from 74.125.24.147 (74.125.24.147): icmp_seq=3 ttl=100 time=242 ms\n```\nI’ll now demonstrate how to detach from the session to simulate a network outage or to simply leave something running overnight. To do this, I hit **Ctrl**, hold that key down, then hit **A**, then hit **D**. That brings me back to the default SSH prompt and I am then able to run `screen -ls` to see my detached session:\n```\n[root@rhel7dev ~]# screen -x\n[detached from 25665.pts-0.rhel7dev]\n[root@rhel7dev ~]# screen -ls\nThere is a screen on:\n    25665.pts-0.rhel7dev    (Detached)\n1 Socket in \/var\/run\/screen\/S-root.\n\n[root@rhel7dev ~]#\n```\n***\\[ You might also enjoy: [Working with pipes on the Linux command line](https:\/\/www.redhat.com\/sysadmin\/pipes-command-line-linux) \\]***\n\nTo resume my screen session, I type `screen -x` because there was only one session as an option. That brought me back to the screen session where the `ping` command is still running:\n```\n[root@rhel7dev ~]# ping www.google.com\nPING www.google.com (74.125.24.147) 56(84) bytes of data.\n64 bytes from 74.125.24.147 (74.125.24.147): icmp_seq=1 ttl=100 time=242 ms\n64 bytes from 74.125.24.147 (74.125.24.147): icmp_seq=2 ttl=100 time=242 ms\n<snipped>\n64 bytes from 74.125.24.147 (74.125.24.147): icmp_seq=19 ttl=100 time=242 ms\n64 bytes from 74.125.24.147 (74.125.24.147): icmp_seq=20 ttl=100 time=242 ms\n^C\n--- www.google.com ping statistics ---\n20 packets transmitted, 20 received, 0% packet loss, time 20278ms\nrtt min\/avg\/max\/mdev = 242.105\/242.197\/242.727\/0.576 ms\n[root@rhel7dev ~]#\n```\nI can have multiple screen sessions at once:\n```\n[root@rhel7dev ~]# screen -ls\nThere is a screen on:\n    25665.pts-0.rhel7dev    (Detached)\n1 Socket in \/var\/run\/screen\/S-root.\n\n[root@rhel7dev ~]# screen\n[detached from 25693.pts-0.rhel7dev]\n[root@rhel7dev ~]# screen -ls\nThere are screens on:\n    25693.pts-0.rhel7dev    (Detached)\n    25665.pts-0.rhel7dev    (Detached)\n2 Sockets in \/var\/run\/screen\/S-root.\n\n[root@rhel7dev ~]# screen\n[detached from 25706.pts-0.rhel7dev]\n[root@rhel7dev ~]# screen -ls\nThere are screens on:\n    25706.pts-0.rhel7dev    (Detached)\n    25693.pts-0.rhel7dev    (Detached)\n    25665.pts-0.rhel7dev    (Detached)\n3 Sockets in \/var\/run\/screen\/S-root.\n\n[root@rhel7dev ~]#\n```\nIn each of those three screen sessions, I can have commands running or simply leave a session sitting at the prompt.\n\nA default `screen -x` will not work to resume a session now because of the multiple screens running:\n```\n[root@rhel7dev ~]# screen -x\nThere are several suitable screens on:\n    25706.pts-0.rhel7dev    (Detached)\n    25693.pts-0.rhel7dev    (Detached)\n    25665.pts-0.rhel7dev    (Detached)\nType \"screen [-d] -r [pid.]tty.host\" to resume one of them.\n\n[root@rhel7dev ~]#\n```\nTo attach to one of my sessions, I need to run `screen -x` and add enough of the screen name to be unique:\n```\n[root@rhel7dev ~]# screen -x 257\n[detached from 25706.pts-0.rhel7dev]\n\n[root@rhel7dev ~]#\n```\nRather than trying to limit yourself to just one session or remembering what is running on which screen, you can set a name for the session by using the `-S` argument:\n```\n[root@rhel7dev ~]# screen -S \"db upgrade\"\n[detached from 25778.db upgrade]\n\n[root@rhel7dev ~]# screen -ls\nThere are screens on:\n    25778.db upgrade    (Detached)\n    25706.pts-0.rhel7dev    (Detached)\n    25693.pts-0.rhel7dev    (Detached)\n    25665.pts-0.rhel7dev    (Detached)\n4 Sockets in \/var\/run\/screen\/S-root.\n\n[root@rhel7dev ~]# screen -x \"db upgrade\"\n[detached from 25778.db upgrade]\n\n[root@rhel7dev ~]#\n```\nTo exit a screen session, you can type `exit` or hit **Ctrl+A** and then **D**.\n\nNow that you know how to start, stop, and label `screen` sessions let's get a little more in-depth. To split your screen session in half vertically hit **Ctrl+A** and then the **\\|** key (**Shift+Backslash**). At this point, you’ll have your screen session with the prompt on the left:\n\n[![Split screen feature of the screen command](https:\/\/www.redhat.com\/rhdc\/managed-files\/sysadmin\/2021-02\/image3_0.png)](https:\/\/www.redhat.com\/rhdc\/managed-files\/sysadmin\/2021-02\/image3_0.png)\n\nTo switch to your screen on the right, hit **Ctrl+A** and then the **Tab** key. Your cursor is now in the right session, but there’s no prompt. To get a prompt hit **Ctrl+A** and then **C**. I can do this multiple times to get multiple vertical splits to the screen:\n\n[![Three split screens with the screen command](https:\/\/www.redhat.com\/rhdc\/managed-files\/sysadmin\/2021-02\/image1_0.png)](https:\/\/www.redhat.com\/rhdc\/managed-files\/sysadmin\/2021-02\/image1_0.png)\n\nYou can now toggle back and forth between the two screen panes by using **Ctrl+A+Tab**.\n\nWhat happens when you `cat` out a file that’s larger than your console can display and so some content scrolls past? To scroll back in the buffer, hit **Ctrl+A** and then **Esc**. You’ll now be able to use the cursor keys to move around the screen and go back in the buffer.\n\nThere are other options for `screen`, so to see them, hit **Ctrl**, then **A**, then the **question mark**:\n\n[![List of options for the screen command](https:\/\/www.redhat.com\/rhdc\/managed-files\/sysadmin\/2021-02\/image2_0.png)](https:\/\/www.redhat.com\/rhdc\/managed-files\/sysadmin\/2021-02\/image2_0.png)\n\n***\\[ Free online course: [Red Hat Enterprise Linux technical overview](https:\/\/www.redhat.com\/en\/services\/training\/rh024-red-hat-linux-technical-overview?intcmp=701f20000012ngPAAQ). \\]***\n\nFurther reading can be found in the man page for `screen`. This article is a quick introduction to using the `screen` command so that a disconnected remote session does not end up killing a process accidentally. Another program that is similar to `screen` is `tmux` and you can read about `tmux` in [this article](https:\/\/www.redhat.com\/sysadmin\/tips-using-tmux).\n***\n### About the author\n[![Peter Gervase](https:\/\/www.redhat.com\/rhdc\/managed-files\/styles\/media_thumbnail\/private\/sysadmin\/pictures\/2020-10\/PeterGervase_0.jpg?itok=lcTNOPDq)](https:\/\/www.redhat.com\/en\/authors\/pgervase)\n\n[Peter Gervase](https:\/\/www.redhat.com\/en\/authors\/pgervase)\n\nI am a Senior Principal Security Architect at Verizon. Before that, I worked at Red Hat in various roles such as consulting and in the Solutions Architect where I specialized in Smart Management, Ansible, and OpenShift. In my free time, I enjoy spending time with my family, exercising, and woodworking.\n\n[Read full bio](https:\/\/www.redhat.com\/en\/authors\/pgervase)\n\n## More like this\nBlog post\n\n### [More than meets the eye: Behind the scenes of Red Hat Enterprise Linux 10 (Part 6)](https:\/\/www.redhat.com\/en\/blog\/more-meets-eye-behind-scenes-red-hat-enterprise-linux-10-part-6)\n\nBlog post\n\n### [More than meets the eye: Behind the scenes of Red Hat Enterprise Linux 10 (Part 5)](https:\/\/www.redhat.com\/en\/blog\/more-meets-eye-behind-scenes-red-hat-enterprise-linux-10-part-5)\n\nOriginal podcast\n\n### [Days of Future Open \\| Command Line Heroes](https:\/\/www.redhat.com\/en\/command-line-heroes\/season-1\/days-of-future-open)\n\nOriginal podcast\n\n### [The Overlooked Operating System \\| Compiler: Stack\/Unstuck](https:\/\/www.redhat.com\/en\/compiler-podcast\/overlooked-operating-system)\n\n## Browse by channel\n[Explore all channels](https:\/\/www.redhat.com\/en\/blog\/channels 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Hat\nRed Hat is an open hybrid cloud technology leader, delivering a consistent, comprehensive foundation for transformative IT and artificial intelligence (AI) applications in the enterprise. As a [trusted adviser to the Fortune 500](https:\/\/www.redhat.com\/en\/about\/company), Red Hat offers cloud, developer, Linux, automation, and application platform technologies, as well as [award-winning](https:\/\/access.redhat.com\/recognition) services.\n\n- [Our company](https:\/\/www.redhat.com\/en\/about\/company)\n- [How we work](https:\/\/www.redhat.com\/en\/about\/our-culture)\n- [Customer success stories](https:\/\/www.redhat.com\/en\/success-stories)\n- [Analyst relations](https:\/\/www.redhat.com\/en\/about\/analysts)\n- [Newsroom](https:\/\/www.redhat.com\/en\/about\/newsroom)\n- [Open source commitments](https:\/\/www.redhat.com\/en\/about\/open-source)\n- [Our social impact](https:\/\/www.redhat.com\/en\/about\/community-social-responsibility)\n- [Jobs](https:\/\/www.redhat.com\/en\/jobs)\n### Change page language\n### Red Hat legal and privacy links\n- [About Red Hat](https:\/\/www.redhat.com\/en\/about\/company)\n- [Jobs](https:\/\/www.redhat.com\/en\/jobs)\n- [Events](https:\/\/www.redhat.com\/en\/events)\n- [Locations](https:\/\/www.redhat.com\/en\/about\/office-locations)\n- [Contact Red Hat](https:\/\/www.redhat.com\/en\/contact)\n- [Red Hat Blog](https:\/\/www.redhat.com\/en\/blog)\n- [Inclusion at Red Hat](https:\/\/www.redhat.com\/en\/about\/our-culture\/inclusion)\n- [Cool Stuff Store](https:\/\/coolstuff.redhat.com\/)\n- [Red Hat Summit](https:\/\/www.redhat.com\/en\/summit)\n\n© 2026 Red Hat\n\n### Red Hat legal and privacy links\n- [Privacy statement](https:\/\/www.redhat.com\/en\/about\/privacy-policy)\n- [Terms of use](https:\/\/www.redhat.com\/en\/about\/terms-use)\n- [All policies and guidelines](https:\/\/www.redhat.com\/en\/about\/all-policies-guidelines)\n- [Digital accessibility](https:\/\/www.redhat.com\/en\/about\/digital-accessibility)","attrs_readable_markdown":"What happens when you’re connected to a remote system, using a long-running program, and then the connection drops? The odds are, at a minimum, you’re going to have to restart the program, and in a worst-case scenario, you’ll have data corruption. To help get around this, some programs run in a window shell on the system. A very basic example of this is the `screen` program:\n```\n[pgervase@pgervase ~]$ ssh root@rhel7dev.usersys.redhat.com\nX11 forwarding request failed on channel 0\nLast login: Wed Jan 27 12:10:06 2021 from xxxxxxxx.redhat.com\n\n[root@rhel7dev ~]# screen\n```\nThis opens my new shell on the `rhel7dev` system. I’ll run the `ping` command below from inside of that session:\n```\n[root@rhel7dev ~]# ping www.google.com\nPING www.google.com (74.125.24.147) 56(84) bytes of data.\n64 bytes from 74.125.24.147 (74.125.24.147): icmp_seq=1 ttl=100 time=242 ms\n64 bytes from 74.125.24.147 (74.125.24.147): icmp_seq=2 ttl=100 time=242 ms\n64 bytes from 74.125.24.147 (74.125.24.147): icmp_seq=3 ttl=100 time=242 ms\n```\nI’ll now demonstrate how to detach from the session to simulate a network outage or to simply leave something running overnight. To do this, I hit **Ctrl**, hold that key down, then hit **A**, then hit **D**. That brings me back to the default SSH prompt and I am then able to run `screen -ls` to see my detached session:\n```\n[root@rhel7dev ~]# screen -x\n[detached from 25665.pts-0.rhel7dev]\n[root@rhel7dev ~]# screen -ls\nThere is a screen on:\n    25665.pts-0.rhel7dev    (Detached)\n1 Socket in \/var\/run\/screen\/S-root.\n\n[root@rhel7dev ~]#\n```\n***\\[ You might also enjoy: [Working with pipes on the Linux command line](https:\/\/www.redhat.com\/sysadmin\/pipes-command-line-linux) \\]***\n\nTo resume my screen session, I type `screen -x` because there was only one session as an option. That brought me back to the screen session where the `ping` command is still running:\n```\n[root@rhel7dev ~]# ping www.google.com\nPING www.google.com (74.125.24.147) 56(84) bytes of data.\n64 bytes from 74.125.24.147 (74.125.24.147): icmp_seq=1 ttl=100 time=242 ms\n64 bytes from 74.125.24.147 (74.125.24.147): icmp_seq=2 ttl=100 time=242 ms\n<snipped>\n64 bytes from 74.125.24.147 (74.125.24.147): icmp_seq=19 ttl=100 time=242 ms\n64 bytes from 74.125.24.147 (74.125.24.147): icmp_seq=20 ttl=100 time=242 ms\n^C\n--- www.google.com ping statistics ---\n20 packets transmitted, 20 received, 0% packet loss, time 20278ms\nrtt min\/avg\/max\/mdev = 242.105\/242.197\/242.727\/0.576 ms\n[root@rhel7dev ~]#\n```\nI can have multiple screen sessions at once:\n```\n[root@rhel7dev ~]# screen -ls\nThere is a screen on:\n    25665.pts-0.rhel7dev    (Detached)\n1 Socket in \/var\/run\/screen\/S-root.\n\n[root@rhel7dev ~]# screen\n[detached from 25693.pts-0.rhel7dev]\n[root@rhel7dev ~]# screen -ls\nThere are screens on:\n    25693.pts-0.rhel7dev    (Detached)\n    25665.pts-0.rhel7dev    (Detached)\n2 Sockets in \/var\/run\/screen\/S-root.\n\n[root@rhel7dev ~]# screen\n[detached from 25706.pts-0.rhel7dev]\n[root@rhel7dev ~]# screen -ls\nThere are screens on:\n    25706.pts-0.rhel7dev    (Detached)\n    25693.pts-0.rhel7dev    (Detached)\n    25665.pts-0.rhel7dev    (Detached)\n3 Sockets in \/var\/run\/screen\/S-root.\n\n[root@rhel7dev ~]#\n```\nIn each of those three screen sessions, I can have commands running or simply leave a session sitting at the prompt.\n\nA default `screen -x` will not work to resume a session now because of the multiple screens running:\n```\n[root@rhel7dev ~]# screen -x\nThere are several suitable screens on:\n    25706.pts-0.rhel7dev    (Detached)\n    25693.pts-0.rhel7dev    (Detached)\n    25665.pts-0.rhel7dev    (Detached)\nType \"screen [-d] -r [pid.]tty.host\" to resume one of them.\n\n[root@rhel7dev ~]#\n```\nTo attach to one of my sessions, I need to run `screen -x` and add enough of the screen name to be unique:\n```\n[root@rhel7dev ~]# screen -x 257\n[detached from 25706.pts-0.rhel7dev]\n\n[root@rhel7dev ~]#\n```\nRather than trying to limit yourself to just one session or remembering what is running on which screen, you can set a name for the session by using the `-S` argument:\n```\n[root@rhel7dev ~]# screen -S \"db upgrade\"\n[detached from 25778.db upgrade]\n\n[root@rhel7dev ~]# screen -ls\nThere are screens on:\n    25778.db upgrade    (Detached)\n    25706.pts-0.rhel7dev    (Detached)\n    25693.pts-0.rhel7dev    (Detached)\n    25665.pts-0.rhel7dev    (Detached)\n4 Sockets in \/var\/run\/screen\/S-root.\n\n[root@rhel7dev ~]# screen -x \"db upgrade\"\n[detached from 25778.db upgrade]\n\n[root@rhel7dev ~]#\n```\nTo exit a screen session, you can type `exit` or hit **Ctrl+A** and then **D**.\n\nNow that you know how to start, stop, and label `screen` sessions let's get a little more in-depth. To split your screen session in half vertically hit **Ctrl+A** and then the **\\|** key (**Shift+Backslash**). At this point, you’ll have your screen session with the prompt on the left:\n\n[![Split screen feature of the screen command](https:\/\/www.redhat.com\/rhdc\/managed-files\/sysadmin\/2021-02\/image3_0.png)](https:\/\/www.redhat.com\/rhdc\/managed-files\/sysadmin\/2021-02\/image3_0.png)\n\nTo switch to your screen on the right, hit **Ctrl+A** and then the **Tab** key. Your cursor is now in the right session, but there’s no prompt. To get a prompt hit **Ctrl+A** and then **C**. I can do this multiple times to get multiple vertical splits to the screen:\n\n[![Three split screens with the screen command](https:\/\/www.redhat.com\/rhdc\/managed-files\/sysadmin\/2021-02\/image1_0.png)](https:\/\/www.redhat.com\/rhdc\/managed-files\/sysadmin\/2021-02\/image1_0.png)\n\nYou can now toggle back and forth between the two screen panes by using **Ctrl+A+Tab**.\n\nWhat happens when you `cat` out a file that’s larger than your console can display and so some content scrolls past? To scroll back in the buffer, hit **Ctrl+A** and then **Esc**. You’ll now be able to use the cursor keys to move around the screen and go back in the buffer.\n\nThere are other options for `screen`, so to see them, hit **Ctrl**, then **A**, then the **question mark**:\n\n[![List of options for the screen command](https:\/\/www.redhat.com\/rhdc\/managed-files\/sysadmin\/2021-02\/image2_0.png)](https:\/\/www.redhat.com\/rhdc\/managed-files\/sysadmin\/2021-02\/image2_0.png)\n\n***\\[ Free online course: [Red Hat Enterprise Linux technical overview](https:\/\/www.redhat.com\/en\/services\/training\/rh024-red-hat-linux-technical-overview?intcmp=701f20000012ngPAAQ). \\]***\n\nFurther reading can be found in the man page for `screen`. This article is a quick introduction to using the `screen` command so that a disconnected remote session does not end up killing a process accidentally. Another program that is similar to `screen` is `tmux` and you can read about `tmux` in [this article](https:\/\/www.redhat.com\/sysadmin\/tips-using-tmux).","meta_canonical":null}

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Boilerpipe Text	What happens when you’re connected to a remote system, using a long-running program, and then the connection drops? The odds are, at a minimum, you’re going to have to restart the program, and in a worst-case scenario, you’ll have data corruption. To help get around this, some programs run in a window shell on the system. A very basic example of this is the screen program: [pgervase@pgervase ~]$ ssh root@rhel7dev.usersys.redhat.com X11 forwarding request failed on channel 0 Last login: Wed Jan 27 12:10:06 2021 from xxxxxxxx.redhat.com [root@rhel7dev ~]# screen This opens my new shell on the rhel7dev system. I’ll run the ping command below from inside of that session: [root@rhel7dev ~]# ping www.google.com PING www.google.com (74.125.24.147) 56(84) bytes of data. 64 bytes from 74.125.24.147 (74.125.24.147): icmp_seq=1 ttl=100 time=242 ms 64 bytes from 74.125.24.147 (74.125.24.147): icmp_seq=2 ttl=100 time=242 ms 64 bytes from 74.125.24.147 (74.125.24.147): icmp_seq=3 ttl=100 time=242 ms I’ll now demonstrate how to detach from the session to simulate a network outage or to simply leave something running overnight. To do this, I hit Ctrl , hold that key down, then hit A , then hit D . That brings me back to the default SSH prompt and I am then able to run screen -ls to see my detached session: [root@rhel7dev ~]# screen -x [detached from 25665.pts-0.rhel7dev] [root@rhel7dev ~]# screen -ls There is a screen on: 25665.pts-0.rhel7dev (Detached) 1 Socket in /var/run/screen/S-root. [root@rhel7dev ~]# [ You might also enjoy: Working with pipes on the Linux command line ] To resume my screen session, I type screen -x because there was only one session as an option. That brought me back to the screen session where the ping command is still running: [root@rhel7dev ~]# ping www.google.com PING www.google.com (74.125.24.147) 56(84) bytes of data. 64 bytes from 74.125.24.147 (74.125.24.147): icmp_seq=1 ttl=100 time=242 ms 64 bytes from 74.125.24.147 (74.125.24.147): icmp_seq=2 ttl=100 time=242 ms <snipped> 64 bytes from 74.125.24.147 (74.125.24.147): icmp_seq=19 ttl=100 time=242 ms 64 bytes from 74.125.24.147 (74.125.24.147): icmp_seq=20 ttl=100 time=242 ms ^C --- www.google.com ping statistics --- 20 packets transmitted, 20 received, 0% packet loss, time 20278ms rtt min/avg/max/mdev = 242.105/242.197/242.727/0.576 ms [root@rhel7dev ~]# I can have multiple screen sessions at once: [root@rhel7dev ~]# screen -ls There is a screen on: 25665.pts-0.rhel7dev (Detached) 1 Socket in /var/run/screen/S-root. [root@rhel7dev ~]# screen [detached from 25693.pts-0.rhel7dev] [root@rhel7dev ~]# screen -ls There are screens on: 25693.pts-0.rhel7dev (Detached) 25665.pts-0.rhel7dev (Detached) 2 Sockets in /var/run/screen/S-root. [root@rhel7dev ~]# screen [detached from 25706.pts-0.rhel7dev] [root@rhel7dev ~]# screen -ls There are screens on: 25706.pts-0.rhel7dev (Detached) 25693.pts-0.rhel7dev (Detached) 25665.pts-0.rhel7dev (Detached) 3 Sockets in /var/run/screen/S-root. [root@rhel7dev ~]# In each of those three screen sessions, I can have commands running or simply leave a session sitting at the prompt. A default screen -x will not work to resume a session now because of the multiple screens running: [root@rhel7dev ~]# screen -x There are several suitable screens on: 25706.pts-0.rhel7dev (Detached) 25693.pts-0.rhel7dev (Detached) 25665.pts-0.rhel7dev (Detached) Type "screen [-d] -r [pid.]tty.host" to resume one of them. [root@rhel7dev ~]# To attach to one of my sessions, I need to run screen -x and add enough of the screen name to be unique: [root@rhel7dev ~]# screen -x 257 [detached from 25706.pts-0.rhel7dev] [root@rhel7dev ~]# Rather than trying to limit yourself to just one session or remembering what is running on which screen, you can set a name for the session by using the -S argument: [root@rhel7dev ~]# screen -S "db upgrade" [detached from 25778.db upgrade] [root@rhel7dev ~]# screen -ls There are screens on: 25778.db upgrade (Detached) 25706.pts-0.rhel7dev (Detached) 25693.pts-0.rhel7dev (Detached) 25665.pts-0.rhel7dev (Detached) 4 Sockets in /var/run/screen/S-root. [root@rhel7dev ~]# screen -x "db upgrade" [detached from 25778.db upgrade] [root@rhel7dev ~]# To exit a screen session, you can type exit or hit Ctrl+A and then D . Now that you know how to start, stop, and label screen sessions let's get a little more in-depth. To split your screen session in half vertically hit Ctrl+A and then the \| key ( Shift+Backslash ). At this point, you’ll have your screen session with the prompt on the left: To switch to your screen on the right, hit Ctrl+A and then the Tab key. Your cursor is now in the right session, but there’s no prompt. To get a prompt hit Ctrl+A and then C . I can do this multiple times to get multiple vertical splits to the screen: You can now toggle back and forth between the two screen panes by using Ctrl+A+Tab . What happens when you cat out a file that’s larger than your console can display and so some content scrolls past? To scroll back in the buffer, hit Ctrl+A and then Esc . You’ll now be able to use the cursor keys to move around the screen and go back in the buffer. There are other options for screen , so to see them, hit Ctrl , then A , then the question mark : [ Free online course: Red Hat Enterprise Linux technical overview . ] Further reading can be found in the man page for screen . This article is a quick introduction to using the screen command so that a disconnected remote session does not end up killing a process accidentally. Another program that is similar to screen is tmux and you can read about tmux in this article .
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The odds are, at a minimum, you’re going to have to restart the program, and in a worst-case scenario, you’ll have data corruption. To help get around this, some programs run in a window shell on the system. A very basic example of this is the `screen` program: ``` [pgervase@pgervase ~]$ ssh root@rhel7dev.usersys.redhat.com X11 forwarding request failed on channel 0 Last login: Wed Jan 27 12:10:06 2021 from xxxxxxxx.redhat.com [root@rhel7dev ~]# screen ``` This opens my new shell on the `rhel7dev` system. I’ll run the `ping` command below from inside of that session: ``` [root@rhel7dev ~]# ping www.google.com PING www.google.com (74.125.24.147) 56(84) bytes of data. 64 bytes from 74.125.24.147 (74.125.24.147): icmp_seq=1 ttl=100 time=242 ms 64 bytes from 74.125.24.147 (74.125.24.147): icmp_seq=2 ttl=100 time=242 ms 64 bytes from 74.125.24.147 (74.125.24.147): icmp_seq=3 ttl=100 time=242 ms ``` I’ll now demonstrate how to detach from the session to simulate a network outage or to simply leave something running overnight. To do this, I hit Ctrl, hold that key down, then hit A, then hit D. That brings me back to the default SSH prompt and I am then able to run `screen -ls` to see my detached session: ``` [root@rhel7dev ~]# screen -x [detached from 25665.pts-0.rhel7dev] [root@rhel7dev ~]# screen -ls There is a screen on: 25665.pts-0.rhel7dev (Detached) 1 Socket in /var/run/screen/S-root. [root@rhel7dev ~]# ``` \[ You might also enjoy: [Working with pipes on the Linux command line](https://www.redhat.com/sysadmin/pipes-command-line-linux) \] To resume my screen session, I type `screen -x` because there was only one session as an option. That brought me back to the screen session where the `ping` command is still running: ``` [root@rhel7dev ~]# ping www.google.com PING www.google.com (74.125.24.147) 56(84) bytes of data. 64 bytes from 74.125.24.147 (74.125.24.147): icmp_seq=1 ttl=100 time=242 ms 64 bytes from 74.125.24.147 (74.125.24.147): icmp_seq=2 ttl=100 time=242 ms <snipped> 64 bytes from 74.125.24.147 (74.125.24.147): icmp_seq=19 ttl=100 time=242 ms 64 bytes from 74.125.24.147 (74.125.24.147): icmp_seq=20 ttl=100 time=242 ms ^C --- www.google.com ping statistics --- 20 packets transmitted, 20 received, 0% packet loss, time 20278ms rtt min/avg/max/mdev = 242.105/242.197/242.727/0.576 ms [root@rhel7dev ~]# ``` I can have multiple screen sessions at once: ``` [root@rhel7dev ~]# screen -ls There is a screen on: 25665.pts-0.rhel7dev (Detached) 1 Socket in /var/run/screen/S-root. [root@rhel7dev ~]# screen [detached from 25693.pts-0.rhel7dev] [root@rhel7dev ~]# screen -ls There are screens on: 25693.pts-0.rhel7dev (Detached) 25665.pts-0.rhel7dev (Detached) 2 Sockets in /var/run/screen/S-root. [root@rhel7dev ~]# screen [detached from 25706.pts-0.rhel7dev] [root@rhel7dev ~]# screen -ls There are screens on: 25706.pts-0.rhel7dev (Detached) 25693.pts-0.rhel7dev (Detached) 25665.pts-0.rhel7dev (Detached) 3 Sockets in /var/run/screen/S-root. [root@rhel7dev ~]# ``` In each of those three screen sessions, I can have commands running or simply leave a session sitting at the prompt. A default `screen -x` will not work to resume a session now because of the multiple screens running: ``` [root@rhel7dev ~]# screen -x There are several suitable screens on: 25706.pts-0.rhel7dev (Detached) 25693.pts-0.rhel7dev (Detached) 25665.pts-0.rhel7dev (Detached) Type "screen [-d] -r [pid.]tty.host" to resume one of them. [root@rhel7dev ~]# ``` To attach to one of my sessions, I need to run `screen -x` and add enough of the screen name to be unique: ``` [root@rhel7dev ~]# screen -x 257 [detached from 25706.pts-0.rhel7dev] [root@rhel7dev ~]# ``` Rather than trying to limit yourself to just one session or remembering what is running on which screen, you can set a name for the session by using the `-S` argument: ``` [root@rhel7dev ~]# screen -S "db upgrade" [detached from 25778.db upgrade] [root@rhel7dev ~]# screen -ls There are screens on: 25778.db upgrade (Detached) 25706.pts-0.rhel7dev (Detached) 25693.pts-0.rhel7dev (Detached) 25665.pts-0.rhel7dev (Detached) 4 Sockets in /var/run/screen/S-root. [root@rhel7dev ~]# screen -x "db upgrade" [detached from 25778.db upgrade] [root@rhel7dev ~]# ``` To exit a screen session, you can type `exit` or hit Ctrl+A and then D. Now that you know how to start, stop, and label `screen` sessions let's get a little more in-depth. To split your screen session in half vertically hit Ctrl+A and then the \\| key (Shift+Backslash). At this point, you’ll have your screen session with the prompt on the left: [![Split screen feature of the screen command](https://www.redhat.com/rhdc/managed-files/sysadmin/2021-02/image3_0.png)](https://www.redhat.com/rhdc/managed-files/sysadmin/2021-02/image3_0.png) To switch to your screen on the right, hit Ctrl+A and then the Tab key. Your cursor is now in the right session, but there’s no prompt. To get a prompt hit Ctrl+A and then C. I can do this multiple times to get multiple vertical splits to the screen: [![Three split screens with the screen command](https://www.redhat.com/rhdc/managed-files/sysadmin/2021-02/image1_0.png)](https://www.redhat.com/rhdc/managed-files/sysadmin/2021-02/image1_0.png) You can now toggle back and forth between the two screen panes by using Ctrl+A+Tab. What happens when you `cat` out a file that’s larger than your console can display and so some content scrolls past? To scroll back in the buffer, hit Ctrl+A and then Esc. You’ll now be able to use the cursor keys to move around the screen and go back in the buffer. There are other options for `screen`, so to see them, hit Ctrl, then A, then the question mark: [![List of options for the screen command](https://www.redhat.com/rhdc/managed-files/sysadmin/2021-02/image2_0.png)](https://www.redhat.com/rhdc/managed-files/sysadmin/2021-02/image2_0.png) \[ Free online course: [Red Hat Enterprise Linux technical overview](https://www.redhat.com/en/services/training/rh024-red-hat-linux-technical-overview?intcmp=701f20000012ngPAAQ). \] Further reading can be found in the man page for `screen`. This article is a quick introduction to using the `screen` command so that a disconnected remote session does not end up killing a process accidentally. Another program that is similar to `screen` is `tmux` and you can read about `tmux` in [this article](https://www.redhat.com/sysadmin/tips-using-tmux). * ### About the author [![Peter Gervase](https://www.redhat.com/rhdc/managed-files/styles/media_thumbnail/private/sysadmin/pictures/2020-10/PeterGervase_0.jpg?itok=lcTNOPDq)](https://www.redhat.com/en/authors/pgervase) [Peter Gervase](https://www.redhat.com/en/authors/pgervase) I am a Senior Principal Security Architect at Verizon. Before that, I worked at Red Hat in various roles such as consulting and in the Solutions Architect where I specialized in Smart Management, Ansible, and OpenShift. In my free time, I enjoy spending time with my family, exercising, and woodworking. 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Readable Markdown	What happens when you’re connected to a remote system, using a long-running program, and then the connection drops? The odds are, at a minimum, you’re going to have to restart the program, and in a worst-case scenario, you’ll have data corruption. To help get around this, some programs run in a window shell on the system. A very basic example of this is the `screen` program: ``` [pgervase@pgervase ~]$ ssh root@rhel7dev.usersys.redhat.com X11 forwarding request failed on channel 0 Last login: Wed Jan 27 12:10:06 2021 from xxxxxxxx.redhat.com [root@rhel7dev ~]# screen ``` This opens my new shell on the `rhel7dev` system. I’ll run the `ping` command below from inside of that session: ``` [root@rhel7dev ~]# ping www.google.com PING www.google.com (74.125.24.147) 56(84) bytes of data. 64 bytes from 74.125.24.147 (74.125.24.147): icmp_seq=1 ttl=100 time=242 ms 64 bytes from 74.125.24.147 (74.125.24.147): icmp_seq=2 ttl=100 time=242 ms 64 bytes from 74.125.24.147 (74.125.24.147): icmp_seq=3 ttl=100 time=242 ms ``` I’ll now demonstrate how to detach from the session to simulate a network outage or to simply leave something running overnight. To do this, I hit Ctrl, hold that key down, then hit A, then hit D. That brings me back to the default SSH prompt and I am then able to run `screen -ls` to see my detached session: ``` [root@rhel7dev ~]# screen -x [detached from 25665.pts-0.rhel7dev] [root@rhel7dev ~]# screen -ls There is a screen on: 25665.pts-0.rhel7dev (Detached) 1 Socket in /var/run/screen/S-root. [root@rhel7dev ~]# ``` *\[ You might also enjoy: [Working with pipes on the Linux command line](https://www.redhat.com/sysadmin/pipes-command-line-linux) \]* To resume my screen session, I type `screen -x` because there was only one session as an option. That brought me back to the screen session where the `ping` command is still running: ``` [root@rhel7dev ~]# ping www.google.com PING www.google.com (74.125.24.147) 56(84) bytes of data. 64 bytes from 74.125.24.147 (74.125.24.147): icmp_seq=1 ttl=100 time=242 ms 64 bytes from 74.125.24.147 (74.125.24.147): icmp_seq=2 ttl=100 time=242 ms <snipped> 64 bytes from 74.125.24.147 (74.125.24.147): icmp_seq=19 ttl=100 time=242 ms 64 bytes from 74.125.24.147 (74.125.24.147): icmp_seq=20 ttl=100 time=242 ms ^C --- www.google.com ping statistics --- 20 packets transmitted, 20 received, 0% packet loss, time 20278ms rtt min/avg/max/mdev = 242.105/242.197/242.727/0.576 ms [root@rhel7dev ~]# ``` I can have multiple screen sessions at once: ``` [root@rhel7dev ~]# screen -ls There is a screen on: 25665.pts-0.rhel7dev (Detached) 1 Socket in /var/run/screen/S-root. [root@rhel7dev ~]# screen [detached from 25693.pts-0.rhel7dev] [root@rhel7dev ~]# screen -ls There are screens on: 25693.pts-0.rhel7dev (Detached) 25665.pts-0.rhel7dev (Detached) 2 Sockets in /var/run/screen/S-root. [root@rhel7dev ~]# screen [detached from 25706.pts-0.rhel7dev] [root@rhel7dev ~]# screen -ls There are screens on: 25706.pts-0.rhel7dev (Detached) 25693.pts-0.rhel7dev (Detached) 25665.pts-0.rhel7dev (Detached) 3 Sockets in /var/run/screen/S-root. [root@rhel7dev ~]# ``` In each of those three screen sessions, I can have commands running or simply leave a session sitting at the prompt. A default `screen -x` will not work to resume a session now because of the multiple screens running: ``` [root@rhel7dev ~]# screen -x There are several suitable screens on: 25706.pts-0.rhel7dev (Detached) 25693.pts-0.rhel7dev (Detached) 25665.pts-0.rhel7dev (Detached) Type "screen [-d] -r [pid.]tty.host" to resume one of them. [root@rhel7dev ~]# ``` To attach to one of my sessions, I need to run `screen -x` and add enough of the screen name to be unique: ``` [root@rhel7dev ~]# screen -x 257 [detached from 25706.pts-0.rhel7dev] [root@rhel7dev ~]# ``` Rather than trying to limit yourself to just one session or remembering what is running on which screen, you can set a name for the session by using the `-S` argument: ``` [root@rhel7dev ~]# screen -S "db upgrade" [detached from 25778.db upgrade] [root@rhel7dev ~]# screen -ls There are screens on: 25778.db upgrade (Detached) 25706.pts-0.rhel7dev (Detached) 25693.pts-0.rhel7dev (Detached) 25665.pts-0.rhel7dev (Detached) 4 Sockets in /var/run/screen/S-root. [root@rhel7dev ~]# screen -x "db upgrade" [detached from 25778.db upgrade] [root@rhel7dev ~]# ``` To exit a screen session, you can type `exit` or hit Ctrl+A and then D. Now that you know how to start, stop, and label `screen` sessions let's get a little more in-depth. To split your screen session in half vertically hit Ctrl+A and then the \\| key (Shift+Backslash). At this point, you’ll have your screen session with the prompt on the left: [![Split screen feature of the screen command](https://www.redhat.com/rhdc/managed-files/sysadmin/2021-02/image3_0.png)](https://www.redhat.com/rhdc/managed-files/sysadmin/2021-02/image3_0.png) To switch to your screen on the right, hit Ctrl+A and then the Tab key. Your cursor is now in the right session, but there’s no prompt. To get a prompt hit Ctrl+A and then C. I can do this multiple times to get multiple vertical splits to the screen: [![Three split screens with the screen command](https://www.redhat.com/rhdc/managed-files/sysadmin/2021-02/image1_0.png)](https://www.redhat.com/rhdc/managed-files/sysadmin/2021-02/image1_0.png) You can now toggle back and forth between the two screen panes by using Ctrl+A+Tab. What happens when you `cat` out a file that’s larger than your console can display and so some content scrolls past? To scroll back in the buffer, hit Ctrl+A and then Esc. You’ll now be able to use the cursor keys to move around the screen and go back in the buffer. There are other options for `screen`, so to see them, hit Ctrl, then A, then the question mark: [![List of options for the screen command](https://www.redhat.com/rhdc/managed-files/sysadmin/2021-02/image2_0.png)](https://www.redhat.com/rhdc/managed-files/sysadmin/2021-02/image2_0.png) *\[ Free online course: [Red Hat Enterprise Linux technical overview](https://www.redhat.com/en/services/training/rh024-red-hat-linux-technical-overview?intcmp=701f20000012ngPAAQ). \]* Further reading can be found in the man page for `screen`. This article is a quick introduction to using the `screen` command so that a disconnected remote session does not end up killing a process accidentally. Another program that is similar to `screen` is `tmux` and you can read about `tmux` in [this article](https://www.redhat.com/sysadmin/tips-using-tmux).
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