Installation class action script (i.inittab)

   # PKGINST parameter provided by installation service
   

   while read src dest
   do
           # remove all entries from the table that are
           # associated with this PKGINST
           sed -e "/^[^:]*:[^:]*:[^:]*:[^#]*#$PKGINST$/d" $dest > /tmp/$$itab ||
                   exit 2
   

           sed -e "s/$/#$PKGINST" $src >> /tmp/$$itab ||
                   exit 2
   

           mv /tmp/$$itab $dest ||
                   exit 2
   done
   if [ "$1" = ENDOFCLASS ]
   then
           /sbin/init q ||
                   exit 2
   fi
   exit 0