Screen - Revision history

Leo at 07:10, 18 August 2023

2023-08-18T07:10:01Z

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	}}		}}

			== Troubleshooting ==

	{{Navbox Linux}}[[Category:Linux]]		=== Screen terminates when SSH disconnects ===
			Whenever SSH disconnects, the server will send a HANGUP signal to Screen. By default, Screen will handle this signal by detaching the session and preserving your running programs in the background. However, if you configured screen with the <code>autodetach off</code> option, screen will handle this signal by terminating the session.

			If this is not the desired behavior and you ''do'' want to have screen keep your sessions when you disconnect, ensure you have <code>autodetach '''on'''</code> set.{{Navbox Linux}}[[Category:Linux]]
	[[Category:LinuxUtilities]]		[[Category:LinuxUtilities]]

Leo at 07:05, 18 August 2023

2023-08-18T07:05:50Z

Show changes

Leo at 22:51, 11 March 2020

2020-03-11T22:51:04Z

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	Screen is a terminal multiplexer and serial terminal. It has some useful features including the ability to lock, detach, and reattach a running session.		Screen is a terminal multiplexer and serial terminal. It has some useful features including the ability to lock, detach, and reattach a running session. [[tmux]] is also another terminal multiplexer offering similar features.

	== Quick Usage ==		== Quick Usage ==

Leo: /* Running a command detached */

2019-09-11T22:28:36Z

Running a command detached

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	=== Running a command detached ===		=== Running a command detached ===
	To run a command in a screen session in the background, use:		To run a command in a screen session in the background using the {{code\|-dm}} flag to specify the command.
	{{code\|screen -S ~~screenname~~ -dm ~~command~~}}		{{highlight\|lang=terminal\|code=
			~ % screen -S test -dm sleep 60
			~ % screen -ls
			There are screens on:
			353.test (Detached)
			}}

			For more complex commands, you may want to wrap the complexity within {{code\|sh -c}}. For instance, to use {{code\|&&}} or to do pipe redirections, enclose it within a subshell.
			{{highlight\|lang=terminal\|code=
			~ % screen -S test -dm sh -c "sleep 60 && echo hello"
			~ % screen -ls
			There are screens on:
			353.test (Detached)
			}}

	=== Running screen through su ===		=== Running screen through su ===

Leo: reorganized content

2019-09-11T22:20:39Z

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			Screen is a terminal multiplexer and serial terminal. It has some useful features including the ability to lock, detach, and reattach a running session.

	== ~~Disable Visual Bell~~ ==		== Quick Usage ==
	~~To disable the visual bell for the current~~ screen ~~instance, hit~~:		Create a new screen with custom screen name:
	{{highlight\|lang=~~text~~\|code=		{{highlight\|lang=terminal\|code=
	~~Ctrl+a Ctrl+g~~		$ screen -S test
	}}		}}

	~~For~~ a ~~permanent fix, put the following into the {{code\|~/~~.~~screenrc}} file~~		This will start a new shell instance inside screen. You can see your current screen session by running
	{{highlight\|lang=~~text~~\|code=		{{highlight\|lang=terminal\|code=
	~~vbell_msg "bell~~: ~~window ~%" # Message for visual bell~~		$ screen -ls
	~~vbellwait 2 # Seconds to pause the screen for visual bell~~		There are screens on:
	~~vbell off # Turns visual bell off~~		30922.test (Attached)
	}}		}}

			Any jobs you run in this screen session can persist even if you log out if you detach from this screen session. Detach from a screen session by hitting {{code\|Ctrl+a}}, {{code\|d}}. This key combination is written as {{code\|C-a d}} in the man pages. If you list the screens running again, you can see that the screen is detached.
	~~== Force Background Redraw ==~~		{{highlight\|lang=terminal\|code=
	~~Screen will sometimes mess with any background colors set by programs such as vim. This will cause weird visuals~~ in ~~the terminal where background colors are only rendered where there is text~~.		$ screen -ls
			There are screens on:
	~~You can force~~ screen ~~to redraw the entire area such that the background colors are preserved~~ by ~~putting the following in your~~ {{code\|.~~screenrc~~}} ~~file:~~		30922.test (Detached)
	{{highlight\|lang=~~text~~\|code=
	~~defbce~~ on
	}}		}}

			You may reconnect to detached screens by their partial name or PID number.
	~~== Scrollback Buffer ==~~		{{highlight\|lang=terminal\|code=
			$ screen -r 3 # by the partial (but unique) PID number
	~~Edit {{code\|~~.~~screenrc}} with:~~		$ screen -r 30922 # or by the full PID number
	{{highlight\|lang=~~text~~\|code=		$ screen -r t # by the partial (but unique) screen name
	~~defscrollback 5000~~		$ screen -r test # or by the full screen name
	}}		}}

	~~Scroll back in a screen terminal by hitting:~~
	~~{{code\|Ctrl-a [}}~~

	~~Navigate using:~~		Scroll back in a screen terminal by hitting {{code\|Ctrl-a [}} and then navigate with one of the following keys in the table.
	{\| class="wikitable"		{\| class="wikitable"
	! Key		! Key
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	\|}		\|}

	== Rename Screen Session ==		== Tips & Tricks ==

			=== Rename Screen Session ===
	In a screen terminal, enter {{code\|Ctrl-a :sessionname}} followed by the new name.		In a screen terminal, enter {{code\|Ctrl-a :sessionname}} followed by the new name.

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	}}		}}

	== Lock a Session ==		=== Lock a Session ===
	You can use screen to lock the virtual terminal by using the {{code\|Ctrl-x}} key.		You can use screen to lock the virtual terminal by using the {{code\|Ctrl-x}} key.

	== Running a command detached ==		=== Running a command detached ===
	To run a command in a screen session in the background, use:		To run a command in a screen session in the background, use:
	{{code\|screen -S screenname -dm command}}		{{code\|screen -S screenname -dm command}}

	== Running screen through su ==		=== Running screen through su ===
	If you are running screen not directly through the terminal (such as through su), you will get the following error message:		If you are running screen not directly through the terminal (such as through su), you will get the following error message:

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	}}		}}

	== Serial ==		=== Serial Console ===
	You can use screen as a serial console as well.		You can use screen as a serial console as well.
	{{highlight\|lang=terminal\|code=		{{highlight\|lang=terminal\|code=
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	Common baud rates are 9600 or 115200.		Common baud rates are 9600 or 115200.


			== Configuration ==
			=== Scrollback Buffer ===
			Scrollback buffer can be changed by editing {{code\|.screenrc}}. Define the following line with the number of lines to scroll back.
			{{highlight\|lang=text\|code=
			defscrollback 5000
			}}


			== Miscellaneous ==
			=== Disable Visual Bell ===
			To disable the visual bell for the current screen instance, hit:
			{{highlight\|lang=text\|code=
			Ctrl+a Ctrl+g
			}}

			For a permanent fix, put the following into the {{code\|~/.screenrc}} file
			{{highlight\|lang=text\|code=
			vbell_msg "bell: window ~%" # Message for visual bell
			vbellwait 2 # Seconds to pause the screen for visual bell
			vbell off # Turns visual bell off
			}}


			=== Force Background Redraw ===
			Screen will sometimes mess with any background colors set by programs such as vim. This will cause weird visuals in the terminal where background colors are only rendered where there is text.

			You can force screen to redraw the entire area such that the background colors are preserved by putting the following in your {{code\|.screenrc}} file:
			{{highlight\|lang=text\|code=
			defbce on
			}}


	{{Navbox Linux}}[[Category:Linux]]		{{Navbox Linux}}[[Category:Linux]]
	[[Category:LinuxUtilities]]		[[Category:LinuxUtilities]]

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	[[Category:Linux]]~~{{Navbox Linux}}~~		{{Navbox Linux}}[[Category:Linux]]
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	[[Category:Linux]]~~{{Navbox Linux}}~~{{Navbox Linux}}		[[Category:Linux]]{{Navbox Linux}}
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	[[Category:Linux]]		[[Category:Linux]]{{Navbox Linux}}
	[[Category:LinuxUtilities]]		[[Category:LinuxUtilities]]
	{{Navbox Linux}}		{{Navbox Linux}}