How to use SCREEN utility - ENG
NAME
screen - screen manager with VT100/ANSI terminal emulation
SYNOPSIS
screen [ -options ] [ cmd [ args ] ]
screen -r [[pid.]tty[.host]]
screen -r sessionowner/[[pid.]tty[.host]]
DESCRIPTION
Screen is a full-screen window manager that multiplexes a physical terminal between
several processes (typically interactive shells). Each virtual terminal provides the
functions of a DEC VT100 terminal and, in addition, several control functions from the ISO
6429 (ECMA 48, ANSI X3.64) and ISO 2022 standards (e.g. insert/delete line and support for
multiple character sets). There is a scrollback history buffer for each virtual terminal
and a copy-and-paste mechanism that allows moving text regions between windows.
When screen is called, it creates a single window with a shell in it (or the specified
command) and then gets out of your way so that you can use the program as you normally
would. Then, at any time, you can create new (full-screen) windows with other programs in
them (including more shells), kill existing windows, view a list of windows, turn output
logging on and off, copy-and-paste text between windows, view the scrollback history,
switch between windows in whatever manner you wish, etc. All windows run their programs
completely independent of each other. Programs continue to run when their window is
currently not visible and even when the whole screen session is detached from the user's
terminal. When a program terminates, screen (per default) kills the window that contained
it. If this window was in the foreground, the display switches to the previous window; if
none are left, screen exits. Shells usually distinguish between running as login-shell or
sub-shell. Screen runs them as sub-shells, unless told otherwise (See shell .screenrc
command).
Everything you type is sent to the program running in the current window. The only
exception to this is the one keystroke that is used to initiate a command to the window
manager. By default, each command begins with a control-a (abbreviated C-a from now on),
and is followed by one other keystroke. The command character and all the key bindings
can be fully customized to be anything you like, though they are always two characters in
length.
Screen does not understand the prefix C- to mean control, although this notation is used
in this manual for readability. Please use the caret notation (^A instead of C-a) as
arguments to e.g. the escape command or the -e option. Screen will also print out control
characters in caret notation.
The standard way to create a new window is to type C-a c. This creates a new window
running a shell and switches to that window immediately, regardless of the state of the
process running in the current window. Similarly, you can create a new window with a
custom command in it by first binding the command to a keystroke (in your .screenrc file
or at the C-a : command line) and then using it just like the C-a c command. In addition,
new windows can be created by running a command like:
screen emacs prog.c
from a shell prompt within a previously created window. This will not run another copy of
screen, but will instead supply the command name and its arguments to the window manager
(specified in the $STY environment variable) who will use it to create the new window.
The above example would start the emacs editor (editing prog.c) and switch to its window.
- Note that you cannot transport environment variables from the invoking shell to the
application (emacs in this case), because it is forked from the parent screen process, not
from the invoking shell.
If /run/utmp is writable by screen, an appropriate record will be written to this file for
each window, and removed when the window is terminated. This is useful for working with
talk, script, shutdown, rsend, sccs and other similar programs that use the utmp file to
determine who you are. As long as screen is active on your terminal, the terminal's own
record is removed from the utmp file. See also C-a L.
GETTING STARTED
COMMAND-LINE OPTIONS
DEFAULT KEY BINDINGS
CUSTOMIZATION
THE MESSAGE LINE
WINDOW TYPES
STRING ESCAPES
FLOW-CONTROL
TITLES (naming windows)
THE VIRTUAL TERMINAL
INPUT TRANSLATION
SPECIAL TERMINAL CAPABILITIES
CHARACTER TRANSLATION
ENVIRONMENT
FILES