be more safier and less confusing at shutdown skeleton wrapper

skel/shutdown

-#!@EXECLINE_SHEBANGPREFIX@/execlineb -S0
+#!@BINDIR@/sh
+# Copyright (c) 2019-2020 Eric Vidal <eric@obarun.org>
+# All rights reserved.
+# 
+# This file is part of Obarun. It is subject to the license terms in
+# the LICENSE file found in the top-level directory of this
+# distribution.
+# This file may not be copied, modified, propagated, or distributed
+# except according to the terms contained in the LICENSE file.
 
-66-shutdown $@
+PROG="shutdown"
+
+usage () {
+cat <<EOF
+
+$PROG [ -h | -p | -r ] time
+
+$PROG <options> time
+
+options :
+    -h: halt the machine
+    -p: poweroff the machine
+    -r: reboot the machine
+
+Time must be one of these formats: [ now | [+]mins | hh:mm ] where: 
+
+    now : triggers the shutdown sequence immediately.
+    mins or +mins : relative time; triggers the shutdown sequence after mins minutes.
+    hh:mm : absolute time; triggers the shutdown sequence when the time hh:mm occurs.
+
+See also 66-shutdown program to more features.
+EOF
+exit 111
+}
+
+die() {
+	printf "${PROG}:fatal: options must be set first\n" >&1
+	usage
+}
+
+[ -z ${1} ] && die
+
+[ ${1:0:1} != '-' ] && die
+
+66-shutdown "${@}"