headlessvnc : ajout fonction usage

bin/headlessvnc

@@ -3,6 +3,17 @@ perror() {
   >&2 printf '\033[1;31mERROR:\033[0m \033[1m%s\033[0m\n' "$*"
 }
 
+usage() {
+  name=$(basename "$0")
+
+  cat << EOF
+${name}: usage
+  ${name} [status] - show if the server is running
+  ${name} start|stop|restart - control the server
+  ${name} help|usage - show help
+EOF
+}
+
 error_usage() {
   perror "invalid usage"
   >&2 usage