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C-a : acladd <code class="replace">username2</code> | C-a : acladd <code class="replace">username2</code> | ||
* At last, allowed users, like <code>username2</code>, can attach to the multiuser session initiated by <code>username1</code>: | * At last, allowed users, like <code>username2</code>, can attach to the multiuser session initiated by <code>username1</code>: | ||
<code class="command">screen</code> - | <code class="command">screen</code> -r <code class="replace">username1</code>/ | ||
=== Note === | |||
* The setuid setting can be avoided if the <code class="command">screen</code> -r <code class="replace">username1</code>/ is done by root (nothing to configure then on Debian systems, as the SCREENDIR is correctly set on this distro by default) | |||
* a <code class="file">$HOME/.screenrc</code> file can be use the systematicaly setup the multiuser mode. A good one for instance: | |||
caption always "%Y-%m-%d %0c%{=b kW} %l %{=r kd}%-Lw%{= bd}%50>%n%f* %t%?(%u)%?%{-}%+Lw%<%{- Wk}" | |||
vbell on | |||
autodetach on | |||
startup_message off | |||
multiuser on | |||
defwritelock on | |||
acladd root | |||
Revision as of 14:41, 31 March 2006
screen is a screen manager with VT100/ANSI terminal emulation.
Basics
- Start a screen session (creates a single window with a shell in it):
screen
- Invoke a screen command (consists of a "Ctrl + a" followed by one other character):
C-a <command_char>
- Detach from this screen terminal (program continues to run when its associated screen session is detached):
C-a d
- Reattach a session (brings foreground a previously detached session):
screen -r
- Invoke a screen customization command (used to set options):
C-a : <customization_command>
Multiuser mode
With multiuser mode, screen reveal itself as a powerfull colaborative administration tool.
Requirements
screenbinary file must be setuid-root:
chmod u+s /usr/bin/screen
screensocket directory must not be NFS mounted (your default must be changed if it is$HOME/.screen):
SCREENDIR=/tmp/screen-username1
Howto
- User, named
username1, initiates a basic screen session:
screen
- Then, he enables multiuser mode for this session:
C-a : multiuser on
- After that, he allows the others, like
username2, to connect to his session:
C-a : acladd username2
- At last, allowed users, like
username2, can attach to the multiuser session initiated byusername1:
screen-rusername1/
Note
- The setuid setting can be avoided if the
screen-rusername1/ is done by root (nothing to configure then on Debian systems, as the SCREENDIR is correctly set on this distro by default) - a
$HOME/.screenrcfile can be use the systematicaly setup the multiuser mode. A good one for instance:
caption always "%Y-%m-%d %0c%{=b kW} %l %{=r kd}%-Lw%{= bd}%50>%n%f* %t%?(%u)%?%{-}%+Lw%<%{- Wk}"
vbell on
autodetach on
startup_message off
multiuser on
defwritelock on
acladd root