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|
#!/bin/sh
silent=0
if [ _"$1" = "_-s" ] ; then
silent=1
shift 1
fi
if [ $# -ne 2 ] ; then
echo usage: `basename $0` '[ -s ] <symlink> <increment>' >&2
exit 1
fi
c=`ls -ld $1|cut -c1`
if [ _"$c" != "_l" ] ; then
if [ $silent -eq 0 ] ; then
echo "Error: $1 is not a symbolic link." >&2
fi
exit 2
fi
AWK=""
# the solaris awk is doin' dawn f...... BS
for awk in nawk gawk awk ; do
for dir in `echo $PATH|tr : " "` ; do
if [ -x $dir/$awk ] ; then
AWK=$dir/$awk
break
fi
done
if [ _$AWK != _ ] ; then
break
fi
done
if [ _$AWK = _ ] ; then
if [ $silent -eq 0 ] ; then
echo 'No awk ? Is this really a lovely UNIX ?' >&2
echo 'Sorry. I have to exit.' >&2
fi
exit 1
fi
points_to=`/bin/ls -l $1|$AWK '{print $NF}'`
trailing_num=`echo $points_to|$AWK '{p=match($0,"[0-9]+$");if(p<1)print 0;else print substr($0,p)}'`
base=`echo $points_to|$AWK '{p=match($NF,"[0-9]+$");if(p<1)print $0;else print substr($0,1,p-1)}'`
new_num=`expr $trailing_num + $2`
if [ ! -f "$base""$new_num" ] ; then
if [ $silent -eq 0 ] ; then
echo Error: Linked file does not exist. >&2
fi
exit 2
fi
/bin/rm -f $1
ln -s "$base""$new_num" $1
EST=$?
if [ $EST -ne 0 ] ; then
if [ $silent -ne 1 ] ; then
echo "Error: Cannot create link." >&2
fi
exit $EST
fi
if [ $silent -eq 0 ] ; then
echo "$base""$new_num"
fi
exit $EST
|
