Advanced Bash−Scripting Guide

#+ but better safe than sorry.
if [ ! −r "$dbfile" ]
then
echo "Unable to read checksum database file!"
exit $E_BAD_DBFILE
fi
# −−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−− #
while read record[n]
do
directory_checked="${record[0]}"
if [ "$directory_checked" != "$directory" ]
then
echo "Directories do not match up!"
# Tried to use file for a different directory.
exit $E_DIR_NOMATCH
fi
if [ "$n" −gt 0 ] # Not directory name.
then
filename[n]=$( echo ${record[$n]} | awk '{ print $2 }' )
# md5sum writes records backwards,
#+ checksum first, then filename.
checksum[n]=$( md5sum "${filename[n]}" )
fi
Advanced Bash−Scripting Guide
if [ "${record[n]}" = "${checksum[n]}" ]
then
echo "${filename[n]} unchanged."
else
echo "${filename[n]} : CHECKSUM ERROR!"
# File has been changed since last checked.
fi
let "n+=1"
done