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GNU screen [man:start]

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man:start [2010/12/28 21:29]
120.203.214.182 NLvsfiwqLim
man:start [2017/07/10 13:43] (current)
163.244.22.11 changed link to main namespace
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-wwwJdq  <a href="http://dvprulychxep.com/">dvprulychxep</a>, [url=http://eqeyyghpfejs.com/]eqeyyghpfejs[/url], [link=http://fcqyngnbvbit.com/]fcqyngnbvbit[/link], http://dlorjpkiotat.com/+<box 70% round green left> 
 +This page (as well as the other pages in the man: namespace) is derived from the ''screen'' man page; please try not to deviate too much from its text. 
 + 
 +If you want to add supplemental information, put it in a page in the main namespace and link to that page from here. 
 +</box> 
 + 
 +====== 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. 
 + 
 +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.  Please use the caret notation ("''^A''" instead of "''C-a''") as arguments to e.g. the [[commands: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 "''[[commands:screen|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 "''[[commands:colon|C-a :]]''" command line) and then using it just like the "''[[commands:screen|C-a c]]''" command.  In addition, new windows can be created by running a command like: 
 + 
 +<code> 
 +screen emacs prog.c 
 +</code> 
 + 
 +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 "/var/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 "''[[commands:login|C-a L]]''". 
 + 
 +====== Getting Started ====== 
 + 
 +Before you begin to use ''screen'' you'll need to make sure you  have  correctly  selected  your terminal  type,  just as you would for any other termcap/terminfo program.  (You can do this by using ''tset'' for example.) 
 + 
 +If you're impatient and want to get started without doing a lot  more  reading,  you  should remember this one command:  "''[[commands:help|C-a ?]]''".  Typing these two characters will display a list of the available ''screen'' commands and their bindings. Each keystroke is  discussed  in  the  section "[[Default Key Bindings]]". The manual section "[[Customization]]" deals with the contents of your .screenrc. 
 + 
 +If your terminal is a "true" auto-margin terminal (it doesn't allow the last position on the screen  to  be updated without scrolling the screen) consider using a version of your terminal's termcap that has automatic margins turned //off//. This will ensure an accurate and  optimal  update of the screen in all circumstances. Most terminals nowadays have "magic" margins (automatic margins plus usable last column). This is the  VT100  style  type  and  perfectly suited  for  ''screen''.  If all you've got is a "true" auto-margin terminal ''screen'' will be content to use it, but updating a character put into the last position on the screen may not be possible  until  the  screen  scrolls or the character is moved into a safe position in some other way. This delay can be shortened by using a terminal with insert-character capability. 
 + 
 +====== Command-Line Options ====== 
 + 
 +See [[Command-Line Options]]. 
 + 
 +====== Default Key Bindings ====== 
 + 
 +See [[Default Key Bindings]]. 
 + 
 +====== Customization ====== 
 + 
 +See [[Customization]]. 
 + 
 +====== The Message Line ====== 
 + 
 +''screen''  displays informational messages and other diagnostics in a //message line//.  While this line is distributed to appear at the bottom of the screen, it can be defined  to  appear  at the top of the screen during compilation.  If your terminal has a status line defined in its termcap, ''screen'' will use this for displaying its messages, otherwise a line of  the  current screen  will be temporarily overwritten and output will be momentarily interrupted. The message line is automatically removed after a few seconds delay, but it  can  also  be  removed early (on terminals without a status line) by beginning to type. 
 + 
 +The  message  line  facility  can be used by an application running in the current window by means of the ANSI //Privacy message// control sequence.  For instance, from  within  the  shell, try something like: 
 + 
 +<code> 
 +echo '<esc>^Hello world from window '$WINDOW'<esc>\\' 
 +</code> 
 + 
 +where  ''<esc>''  is  an escape, ''^'' is a literal up-arrow, and ''\\'' turns into a single backslash. 
 + 
 +====== Window Types ====== 
 + 
 +See [[Window Types]]. 
 + 
 +====== String Escapes ====== 
 + 
 +See [[String Escapes]]. 
 + 
 +====== Flow-Control ====== 
 + 
 +See [[Flow-Control]]. 
 + 
 +====== Session Name (naming sessions) ====== 
 + 
 +See [[:sessionnames]] 
 + 
 +====== Titles (naming windows) ====== 
 + 
 +See [[Titles]]. 
 + 
 +====== The Virtual Terminal ====== 
 + 
 +See [[The Virtual Terminal]]. 
 + 
 +====== Input Translation ====== 
 + 
 +See [[Input Translation]]. 
 + 
 +====== Special Terminal Capabilities ====== 
 + 
 +See [[Special Terminal Capabilities]]. 
 + 
 +====== Character Translation ====== 
 + 
 +See [[Character Translation]]. 
 + 
 +====== Environment ====== 
 + 
 +  ; COLUMNS        : Number of columns on the terminal (overrides termcap entry). 
 +  ; HOME           : Directory in which to look for .screenrc. 
 +  ; LINES          : Number of lines on the terminal (overrides termcap entry). 
 +  ; LOCKPRG        : Screen lock program. 
 +  ; NETHACKOPTIONS : Turns on nethack option. 
 +  ; PATH           : Used for locating programs to run. 
 +  ; SCREENCAP      : For customizing a terminal's TERMCAP value. 
 +  ; SCREENDIR      : Alternate socket directory. 
 +  ; SCREENRC       : Alternate user screenrc file. 
 +  ; SHELL          : Default shell program for opening windows (default "''/bin/sh''"). 
 +  ; STY            : Alternate socket name. 
 +  ; SYSSCREENRC    : Alternate system screenrc file. 
 +  ; TERM           : Terminal name. 
 +  ; TERMCAP        : Terminal description. 
 +  ; WINDOW         : Window number of a window (at creation time). 
 + 
 +====== Files ====== 
 + 
 +| $SYSSCREENRC\\ /etc/screenrc | screen initialization commands | 
 +| $SCREENRC\\ $HOME/.screenrc | Read in after /etc/screenrc | 
 +| $SCREENDIR/S-//<login>//\\ /var/run/screen/S-//<login>//        | Socket directories (default) | 
 +| /usr/tmp/screens/S-<login>       | Alternate socket directories. | 
 +| <socket directory>/.termcap      | Written by the [[commands:dumptermcap|termcap output function]] | 
 +| /usr/tmp/screens/screen-exchange\\ /tmp/screen-exchange | screen 'interprocess communication buffer' | 
 +| hardcopy.[0-9]                  | Screen images created by the hardcopy function | 
 +| screenlog.[0-9]                  | Output log files created by the log function | 
 +| /usr/lib/terminfo/?/*\\ /etc/termcap                     | Terminal capability databases | 
 +| /var/run/utmp                    | Login records | 
 +| $LOCKPRG                         | Program that locks a terminal. | 
 + 
 +====== See Also ====== 
 + 
 +''termcap(5)'', ''utmp(5)'', ''vi(1)'', ''captoinfo(1)'', ''tic(1)'' 
 + 
 +====== Authors ====== 
 + 
 +Originally  created  by  Oliver  Laumann, this latest version was produced by Wayne Davison, Juergen Weigert and Michael Schroeder. 
 + 
 +====== Copyleft ====== 
 + 
 +  * Copyright (C) 1993-2003 
 +    * Juergen Weigert (jnweiger@immd4.informatik.uni-erlangen.de) 
 +    * Michael Schroeder (mlschroe@immd4.informatik.uni-erlangen.de) 
 +  * Copyright (C) 1987 Oliver Laumann 
 + 
 +This program is free software; you can redistribute it and/or modify it under the  terms  of the  GNU General Public License as published by the Free Software Foundation; either [[http://www.gnu.org/licenses/gpl-2.0.html|version 2]], or (at your option) any later version. 
 + 
 +This program is distributed in the hope that it will be useful, but  WITHOUT  ANY  WARRANTY; without  even  the  implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. 
 + 
 +You should have received a copy of the GNU General Public License along  with  this  program (see the file COPYING); if not, write to the Free Software Foundation, Inc., 59 Temple Place Suite 330, Boston, MA  02111-1307, USA 
 + 
 +====== Contributors ====== 
 + 
 +  * Ken Beal (kbeal@amber.ssd.csd.harris.com), 
 +  * Rudolf Koenig (rfkoenig@immd4.informatik.uni-erlangen.de), 
 +  * Toerless Eckert (eckert@immd4.informatik.uni-erlangen.de), 
 +  * Wayne Davison (davison@borland.com), 
 +  * Patrick Wolfe (pat@kai.com, kailand!pat), 
 +  * Bart Schaefer (schaefer@cse.ogi.edu), 
 +  * Nathan Glasser (nathan@brokaw.lcs.mit.edu), 
 +  * Larry W. Virden (lvirden@cas.org), 
 +  * Howard Chu (hyc@hanauma.jpl.nasa.gov), 
 +  * Tim MacKenzie (tym@dibbler.cs.monash.edu.au), 
 +  * Markku Jarvinen (mta@{cc,cs,ee}.tut.fi), 
 +  * Marc Boucher (marc@CAM.ORG), 
 +  * Doug Siebert (dsiebert@isca.uiowa.edu), 
 +  * Ken Stillson (stillson@tsfsrv.mitre.org), 
 +  * Ian Frechett (frechett@spot.Colorado.EDU), 
 +  * Brian Koehmstedt (bpk@gnu.ai.mit.edu), 
 +  * Don Smith (djs6015@ultb.isc.rit.edu), 
 +  * Frank van der Linden (vdlinden@fwi.uva.nl), 
 +  * Martin Schweikert (schweik@cpp.ob.open.de), 
 +  * David Vrona (dave@sashimi.lcu.com), 
 +  * E. Tye McQueen (tye%spillman.UUCP@uunet.uu.net), 
 +  * Matthew Green (mrg@eterna.com.au), 
 +  * Christopher Williams (cgw@pobox.com), 
 +  * Matt Mosley (mattm@access.digex.net), 
 +  * Gregory Neil Shapiro (gshapiro@wpi.WPI.EDU), 
 +  * Johannes Zellner (johannes@zellner.org), 
 +  * Pablo Averbuj (pablo@averbuj.com). 
 + 
 +====== Version ====== 
 + 
 +This is version 4.0.2. Its roots are a merge of a custom version 2.3PR7 by Wayne Davison and several  enhancements  to  Oliver Laumann's version 2.0. Note that all versions numbered 2.x are copyright by Oliver Laumann. 
 + 
 +====== Availability ====== 
 + 
 +The latest official release of ''screen'' available  via  anonymous  ftp  from  [[ftp://gnudist.gnu.org]], [[ftp://nic.funet.fi]]  or  any other GNU distribution site. The home site of screen is [[ftp://ftp.uni-erlangen.de]], in the directory pub/utilities/screen. The subdirectory `private' contains the  latest beta testing release. If you want to help, send a note to [[screen@uni-erlangen.de]]. 
 + 
 +====== Bugs ====== 
 + 
 +  * '''dm'''  (delete  mode) and '''xs''' are not handled correctly (they are ignored).  '''xn''' is treated as a magic-margin indicator. 
 + 
 +  * ''screen'' has no clue about double-high or double-wide characters.   But  this is the only area where ''vttest'' is allowed to fail. 
 + 
 +  * It  is  not possible to change the environment variable $TERMCAP when reattaching under a different terminal type. 
 + 
 +  * The support of terminfo based systems is very limited. Adding  extra  capabilities to $TERMCAP may not have any effects. 
 + 
 +  * ''screen'' does not make use of hardware tabs. 
 + 
 +  * ''screen''  must  be  installed  as  set-uid with owner root on most systems in order to be able to correctly change the owner of the tty device  file  for each  window.   Special  permission  may also be required to write the file "/var/run/utmp". 
 + 
 +  * Entries in "/var/run/utmp" are not  removed  when  ''screen''  is  killed  with SIGKILL.   This  will cause some programs (like "''w''" or "''rwho"'') to advertise that a user is logged on who really isn't. 
 + 
 +  * ''screen'' may give a strange warning when your tty has no utmp entry. 
 + 
 +  * When the modem line was hung up, ''screen'' may not  automatically  detach  (or quit)  unless  the device driver is configured to send a HANGUP signal.  To detach a ''screen'' session use the -D or -d command line option. 
 + 
 +  * If a password is set, the command line options -d and  -D  still  detach  a session without asking. 
 + 
 +  * Both "''[[commands:breaktype]]''" and "''[[commands:defbreaktype]]''" change the break generating method used by all terminal devices. The first should change a window specific setting, where the latter should change only the default for new windows. 
 + 
 +  * When  attaching  to  a  multiuser session, the user's .screenrc file is not sourced. Each user's personal settings have to be included in the .screenrc file from which the session is booted, or have to be changed manually. 
 + 
 +  * A  weird  imagination is most useful to gain full advantage of all the features. 
 + 
 +  * Send bug-reports, fixes, enhancements, t-shirts, money,  beer  &  pizza  to [[screen@uni-erlangen.de]]. 
 
man/start.1293571779.txt.gz · Last modified: 2010/12/28 21:29 by 120.203.214.182
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