- while (( $# > 0 )); do
- if islinux; then
- cp -a "$1" "$1_$(date --iso-8601=m)"
- elif isopenbsd; then
- cp -R "$1" "$1_$(date "+%FT%H:%M")"
- else;
- echo 'sorry, not yet implemented, send a patch!' >&2
- fi
- shift
+ local current_date=$(date -u "+%Y-%m-%dT%H:%M:%SZ")
+ local clean keep move verbose result all to_bk
+ setopt extended_glob
+ keep=1
+ while getopts ":hacmrv" opt; do
+ case $opt in
+ a) (( all++ ));;
+ c) unset move clean && (( ++keep ));;
+ m) unset keep clean && (( ++move ));;
+ r) unset move keep && (( ++clean ));;
+ v) verbose="-v";;
+ h) cat <<__EOF0__
+bk [-hcmv] FILE [FILE ...]
+bk -r [-av] [FILE [FILE ...]]
+Backup a file or folder in place and append the timestamp
+Remove backups of a file or folder, or all backups in the current directory
+
+Usage:
+-h Display this help text
+-c Keep the file/folder as is, create a copy backup using cp(1) (default)
+-m Move the file/folder, using mv(1)
+-r Remove backups of the specified file or directory, using rm(1). If none
+ is provided, remove all backups in the current directory.
+-a Remove all (even hidden) backups.
+-v Verbose
+
+The -c, -r and -m options are mutually exclusive. If specified at the same time,
+the last one is used.
+
+The return code is the sum of all cp/mv/rm return codes.
+__EOF0__
+return 0;;
+ \?) bk -h >&2; return 1;;
+ esac