+ local current_date=$(date -u "+%Y-%m-%dT%H:%M:%SZ")
+ local keep move verbose result
+ usage() {
+ cat << EOT
+bk [-hcmv] FILE [FILE ...]
+Backup a file or folder in place and append the timestamp
+
+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)
+-v Verbose
+
+The -c and -m options can't be used at the same time. If both specified, the
+last one is used.
+
+The return code is the sum of all cp/mv return codes.
+EOT
+ }
+ keep=1
+ while getopts ":hcmv" opt; do
+ case $opt in
+ c) unset move && (( ++keep ));;
+ m) unset keep && (( ++move ));;
+ v) verbose="-v";;
+ h) usage;;
+ \?) usage >&2; return 1;;
+ esac
+ done
+ shift "$((OPTIND-1))"
+ if (( keep > 0 )); then
+ while (( $# > 0 )); do
+ if islinux; then
+ cp $verbose -a "$1" "$1_$current_date"
+ elif isfreebsd; then
+ if [[ -d "$1" ]] && [[ "$1" == */ ]]; then
+ echo "cowardly refusing to copy $1 's content; see cp(1)" >&2; return 1
+ else
+ cp $verbose -a "$1" "$1_$current_date"
+ fi
+ else;
+ cp $verbose -pR "$1" "$1_$current_date"
+ fi
+ (( result += $? ))
+ shift
+ done
+ elif (( move > 0 )); then
+ while (( $# > 0 )); do
+ mv $verbose "$1" "$1_$current_date"
+ (( result += $? ))
+ shift
+ done
+ fi
+ return $result