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This section describes the commands for creating a new window for running programs. When a new window is created, the first available number from the range 0...9 is assigned to it. There can be no more than 10 windows active at any one time.
Change the current directory of
screen to the specified directory
or, if called without an argument, to your home directory (the value of
the environment variable
$HOME). All windows that are created by means
screen command from within `.screenrc' or by means of
C-a : screen ... or C-a c use this as their default
directory. Without a
chdir command, this would be the directory
screen was invoked. Hardcopy and log files are always
written to the window's default directory, not the current
directory of the process running in the window. You can use this
command multiple times in your `.screenrc' to start various windows
in different default directories, but the last
chdir value will
affect all the windows you create interactively.
(C-a c, C-a C-c)
Establish a new window. The flow-control options (`-f', `-fn' and `-fa'), title option (`-t'), login options (`-l' and `-ln') , terminal type option (`-T term') and scrollback option (`-h num') may be specified for each command. If an optional number n in the range 0...9 is given, the window number n is assigned to the newly created window (or, if this number is already in-use, the next available number). If a command is specified after
screen, this command (with the given
arguments) is started in the window; otherwise, a shell is created.
If a tty (character special device) name (e.g. `/dev/ttyS0') is specified as cmd, then the window is directly connected to this device. This is similar to the cmd `kermit -l /dev/ttyS0 -c' but saves resources and is more efficient.
Thus, if your `.screenrc' contains the lines
# example for .screenrc: screen 1 screen -fn -t foobar 2 telnet foobar
screen creates a shell window (in window #1) and a window with a
TELNET connection to the machine foobar (with no flow-control using the
title `foobar' in window #2). If you do not include any
screen commands in your `.screenrc' file, then
defaults to creating a single shell window, number zero. When the
initialization is completed,
screen switches to the last window
specified in your .screenrc file or, if none, it opens default window
Set the environment variable var to value string. If only var is specified, the user will be prompted to enter a value. If no parameters are specified, the user will be prompted for both variable and value. The environment is inherited by all subsequently forked shells.
Command: unsetenv var
Unset an environment variable.
Set the command to be used to create a new shell. This overrides the value of the environment variable
$SHELL. This is useful if
you'd like to run a tty-enhancer which is expecting to execute the
program specified in
$SHELL. If the command begins with
a `-' character, the shell will be started as a login-shell.
Command: shelltitle title
Set the title for all shells created during startup or by the C-a C-c command. See section Naming Windows (Titles), for details about what titles are.
In each window
screen opens, it sets the
variable to `screen' by default, unless no description for
`screen' is installed in the local termcap or terminfo data base.
In that case it pretends that the terminal emulator is `vt100'.
This won't do much harm, as
screen is VT100/ANSI compatible. The
use of the
term command is discouraged for non-default purpose.
That is, one may want to specify special
$TERM settings (e.g. vt100) for
screen rlogin othermachine command. Use the command
screen -T vt100 rlogin othermachine rather than setting
term vt100) and resetting (
term screen) the default
before and after the
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