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@@ -0,0 +1,113 @@ +Installation of screen3.6 jw 9.04.95 + + +0.) This instruction is quite lengthy +------------------------------------- +.. and there are still important items near the end. Start here: +Unpack. Screen comes as a compressed tar archive. You need gzip to +uncompress. And... well, you probably already managed that step, +when you are reading this. + +For general documentation on the coding and usage standards this +distributions follows, see the GNU standards document on +prep.ai.mit.edu:pub/gnu/standards.*, especially the `Makefile +Conventions', `Configuration', and `User Interfaces' sections. + +0.) autogen.sh +-------------- +First, run ./autogen.sh. This will create configure file that you can use. + +1.) configure & config.status +----------------------------- +Run configure. This should create a reasonable Makefile and a config.h file +suited for your machine. Rename config.status to reflect the architecture +(hostname) where it was built. To reconfigure quickly for that architecture +just run that config.status file. +If this process fails, try to find out what configure did do and what it +should have checked. Mail me. +Actually the initial Makefile that comes with the distribution just runs +configure -- thus you can start by typing 'make' right after unpacking. +You will be prompted to run 'make' again, which will really make screen. + +2.) Makefile & config.h +----------------------- +Look through the Makefile & user configuration section in config.h and check +pathnames. Change them to suit your installation requirements. Usually +sysadmins discuss the location of SOCKDIR, whether it should be in /tmp or +not. At least it must be on a filesystem that supports sockets/fifos. +SOCKDIR must not point into an AFS (Andrew File System) mounted directory. +If you are uncertain about your NFS implementation, use a UFS directory for +SOCKDIR. Personally, I favour a users home directory and recommend the the +/tmp/ area. +The path for ETCSCREENRC may also need to be adapted. + +3.) how to actually compile +--------------------------- +Run 'make'. Screen should compile without too many warnings :) +The creation of term.h, comm.h, tty.c or osdef.h may fail on some machines +for some odd reason. (E.g. the sed under SCO-unix is known to be +case-insensitive and breaks term.h.) If so, please mail a short description +of the problem to screen-devel@gnu.org and use the files ending in .dist +as a replacement (or in case of osdef.h retry with an empty file). +You can then try 'make install' (if you dare). + +4.) where to install +-------------------- +You may well run screen from your private binary directory and with a +private socket directory like $HOME/.screen. But to have a full featured +screen and (from a users point of view) more secure pty's you should +consult a system administrator and discuss installing screen setuid-root +in some globally accessible directory like /usr/local/bin. + +Consider this, when deciding whether you install screen setuid-root: +- On some machines root privileges are required to open pty's. +- Pty's should be owned by the user, so that she can do chmod to prevent + intruder attacks. The PTYs used by screen will remain world read-writable + if screen is not installed setuid-root. +- Some commands only work properly when the pty is owned by the user. + These include mesg and biff. +- The ^At feature may need to lseek and read the kernel file to retrieve + the load average. +- On most machines utmp slots can only be created/manipulated with root + privileges. Users will appear to be logged on the primary terminal + instead of the screen windows, if screen is not installed setuid-root. +- Multi-user screen sessions are only allowed when screen has a root-s-bit. +- If screen sockets of multiple users are kept in one directory (e.g. + /tmp/screens), this directory must be world writable when screen is not + installed setuid-root. Any user can remove or abuse any socket then. + + +5.) doc/screen.1 & doc/screen.texinfo +------------------------------------- +The man page doc/screen.1 should go to /usr/local/man/man1, or some similar +directory. It should format nicely with nroff -man. If it does not, then +try removing extra dots with: sed -e 's/^\.\././' < screen.1 | nroff -man +The info page doc/screen.texinfo contains basically the same information as +the man-page, we may have missed one or another thing in one of the files. +If so, mail me. + +6.) etc/screenrc & etc/etcscreenrc +---------------------------------- +The files screenrc and etc/etcscreenrc are instructive samples that +demonstrate what can/should be done from your private .screenrc and from +$ETCSCREENRC -- do not just copy them. Read them. Look through the +etcscreenrc file for system wide defaults that you like to set. e.g. +autodetach off, startup_message off, vbell on, ... +Since version 3.2.15 the screenrc file syntax changed slightly. All rc files +from previous versions should be run through the 'newsyntax' script that comes +with this package. +If and only if you want to install screen as a console multiplexer, look +at the *.sample files and what 'make cscreen' suggests. + +7.) terminfo/screeninfo.src & terminfo/screencap +------------------------------------------------ +Every now and then we update the termcap/terminfo entries for screen. +E.g. keycodes were added in 3.6.0 -- thus you check that your termcap/terminfo +database is up to date. See the README in the terminfo subdirectory. + +8.) have fun +------------ +To get an idea what the basic screen commands are, read the file README. +Request snail mail address for liquid and solid donations. :-) + +Juergen & Michael. (screen@uni-erlangen.de) |