sde-lock-screen

#!/bin/sh
# -%- indent-width: 4; use-tabs: no; -%-
#
# sde-lock-screen - try to lock the screen
#
# Copyright (c) 2010 Guido Berhoerster <gber@opensuse.org>
#
# Permission to use, copy, modify, and distribute this software for any
# purpose with or without fee is hereby granted, provided that the above
# copyright notice and this permission notice appear in all copies.
#
# THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
# WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
# TORTIOUS ACTION, ARISING OUT OF
# PERFORMANCE OF THIS SOFTWARE.

PATH=/bin:/usr/bin
export PATH

for lock_cmd in \
    "xscreensaver-command -lock" \
    "gnome-screensaver-command --lock"
do
    $lock_cmd >/dev/null 2>&1 && exit
done

for lock_cmd in \
    "slock" \
    "xlock -mode blank"
do
    set -- $lock_cmd
    if command -v -- $1 >/dev/null 2>&1; then
        $lock_cmd >/dev/null 2>&1 &
        exit
    fi
done

exit 1