+Where
+
+ --help|-h
+ prints this help
+
+ --mem|-m
+ stores the current state of the directory
+
+ + <file> [<file> ...]
+ switches the presence/absence of the indicated files in the
+ stored state
+
+EOF
+ if [[ ! "$1" == "-h" ]] && [[ ! "$1" == "--help" ]]; then
+ echo >&2 "Unknown option \`\`$1''."
+ return 1
+ fi