add -V

README.md

@@ -68,6 +68,8 @@ Usage
         -n             dry-run, don't actually create snapshots
         -x             don't automatically append the date in epoch to
                        the snapshot name
+        -V             print the version number and exit
+
 Development Notes
 -----------------
 

zfs-snapshot-all

@@ -6,6 +6,8 @@
 # Date: November 20, 2015
 # License: MIT
 
+VERSION='v1.0.0'
+
 usage() {
 	local prog=${0##*/}
 	cat <<-EOF
@@ -29,16 +31,18 @@ usage() {
 	    -n             dry-run, don't actually create snapshots
 	    -x             don't automatically append the date in epoch to
 	                   the snapshot name
+	    -V             print the version number and exit
 	EOF
 }
 
 dryrun=false
 date=true
-while getopts 'hnx' option; do
+while getopts 'hnxV' option; do
 	case "$option" in
 		h) usage; exit 0;;
 		n) dryrun=true;;
 		x) date=false;;
+		V) echo "$VERSION"; exit 0;;
 		*) usage; exit 1;;
 	esac
 done