Re: automatically set DISPLAY after telnet/rlogin ?

[Ossama Othman <othman@astrosun.tn.cornell.edu>]

I don't think prompts is what he was asking about, nor does he have to use
ssh (although this would be preferrable).  I've seen this done using some
shell commands in a .cshrc or .profile file that is called after login.

Here are shell scripts that I found you can source or place in your .cshrc
or .profile.  Modify them as necessary:

----------------------------------
C Shell version:
----------------------------------
#!/bin/csh -f
# Script to set the DISPLAY variable for login sessions.
# To use this script, put the line "source /usr/local/bin/setdisplay.csh"
# in your .login file.
#
set UNAME = `uname`
if ( $?DISPLAY ) then
  echo "DISPLAY $DISPLAY via environment"
else if ( $term =~ *@* ) then

    # kludge to handle setting of DISPLAY variable for X.  Requires use of
    # 'xrlogin' to work.
    setenv DISPLAY `echo $term | sed -e 's/.*@//'`
    set term = `echo $term | sed 's/@.*//'`
    echo "DISPLAY $DISPLAY via xrlogin"

else if ( $term == "xterm" || $term == "aixterm" || $term == "aixterm-m" || $term == "sun-cmd" ) then

    # Even worse kludge.  Does not work for X terminals.
    # Only node is usually valid, rest is truncated
    if ( $UNAME != IRIX64 ) then
       set xwhence = `who am i | sed -n -e 's/^.*(\([^.)]*\).*$/\1/p'`
    else
       set xwhence = `w -h | sed -n -e '/'$USER'/s/^[^A-Z]*\([A-Z]*[^\.]\).*/\1/p' | head -1`
    endif
    if ( $xwhence == '' ) then
       echo "DISPLAY cannot be set via who am i"
       unsetenv DISPLAY
    else
       setenv DISPLAY $xwhence:0
       if ( $UNAME != IRIX64 ) then
          echo "DISPLAY $DISPLAY via who am i"
       else
          echo "DISPLAY $DISPLAY via w, WRONG if from Xterminal"
       endif
    endif
    unset xwhence
else
    echo "DISPLAY not set, term is $term"
endif

----------------------------------------
Bourne/Korn Shell version:
-----------------------------------------
#!/bin/ksh
#
# to use this script, put the line "source /usr/local/bin/setdisplay"
# in your .login file.

if [ $DISPLAY ]; then
  echo "DISPLAY $DISPLAY via environment"
else
  if [ ! -z "`echo $TERM | grep '@'`" ]; then
  # kludge to handle setting of DISPLAY variable for X.  Requires use of
  # 'xrlogin' to work.
    DISPLAY=`echo $TERM | sed 's/.*@//'`
    TERM=`echo $TERM | sed 's/@.*//'`
    export DISPLAY TERM
    echo DISPLAY $DISPLAY via xrlogin
  else
    if [ $TERM = xterm -o $TERM = aixterm -o $TERM = aixterm-m -o $TERM = sun-cmd ]; then
  # even worse kludge.  Does not work for X terminals.
      xwhence=`who am i | sed -n -e 's/^.*(\([^.)]*\).*$/\1/p'`;
      if [ $xwhence = '' ]; then
        echo "DISPLAY cannot be set via who am i"
        DISPLAY=
      else
        DISPLAY=$xwhence:0;
        echo DISPLAY $DISPLAY via who am i;
      fi
      export DISPLAY
      xwhence=
    fi
  fi
fi

------------------------------



Good luck!  :)

-Ossama


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