Find the revision number previous to the given one for the given file

GetPrevRevision.bash

#!/bin/bash

# Given a filename and a revision number, find the revision number previous to this one.

fname=$1
curr=$2
prev=""

for revnum in `svn log -q $fname | awk '/^r/ {print $1}' | sed -e 's/r//' | sort -n`
do

    if [ "$curr" == "$revnum" ]
    then
        break
    else
        prev=$revnum
    fi

done
echo $prev

exit 0