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#! /bin/sh
dir=
suffix=
retainweeks=3
dry_run=
verbose=:
help() {
cat <<EOF
usage: $0 [OPTIONS] DIR
cleans up old backup files in DIR
OPTIONS are:
-s, --suffix SUF consider only file names ending in SUF
-r, --retain N retain N last weeks of backups (default $retainweeks)
-v, --verbose verbosely list what is being done
-n, --dry-run do nothing, print what would have been done
-h, --help print this help list
EOF
exit 0
}
while [ $# -ne 0 ]
do
case $1 in
-s|--suffix) shift; suffix=$1;;
-r|--retain) shift; retainweeks=$1;;
-v|--verbose) verbose=echo;;
-n|--dry-run) dry_run=echo; verbose=echo;;
-h|--help) help;;
--) shift; break;;
-*) echo >&2 "$0: unrecognized option $1"
exit 1;;
*) break
esac
shift
done
case $# in
0) echo >&2 "$0: not enough arguments"
exit 1;;
1) dir=$1;;
*) echo >&2 "$0: too many arguments"
exit 1;;
esac
thisweek=$(date +%U)
lastweek=$((thisweek - retainweeks))
$verbose \# removing files older than week $lastweek
if [ -z "$suffix" ]; then
find $dir -type f -printf '%f\n'
else
find $dir -type f -name "*$suffix" -printf '%f\n'
fi |
while read name
do
$verbose \# considering $name
week=$(expr "$name" : '[^-][^-]*-\([0-9][0-9]*\)-.*')
if [ $week -le $lastweek ]; then
$verbose \# removing $name
$dry_run rm $dir/$name
fi
done
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