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The wrapper /usr/bin/gs checks if it is executed setuid. In this case
it aborts --- otherwise the user can execute programs with root
privileges by setting variable $GSREAL (see below).
Then it checks to see if the user gave any papersize options -- if
not, it'll add "-dDEVICEWIDTHPOINTS=..." (and height), and it will
read the width and height to use from libpaper.
Then it checks to see if $DISPLAY is defined in the environment -- if
not, it'll add "-sDEVICE=lvga256" to the command line (x11 is the
default device).
Finally it executes $GSREAL, or if that variable is not defined,
/usr/lib/ghostscript/M.NN/gs.real.
Please read /usr/doc/setuid id you want gs to be executed by the users
on the virtual consoles.
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