Hello Lucan,
here you go:
#!/bin/bash
THIS_NAME="$(basename "${0}")"
HOST_USER="openhab"
HOST_NAME="nas.home.lan"
HOST_MAC="xx:xx:xx:xx:xx:xx"
case "${1}" in
[oO][nN])
exec sudo /usr/sbin/etherwake "${HOST_MAC}" >/dev/null 2>&1
;;
[oO][fF][fF])
exec ssh -o ConnectTimeout=3 -o StrictHostKeyChecking=no -o UserKnownHostsFile=/dev/null -l "${HOST_USER}" "${HOST_NAME}" "sudo /sbin/poweroff" >/dev/null 2>&1
;;
[sS][tT][aA][tT][uU][sS])
ping -c 1 -W 1 "${HOST_NAME}" >/dev/null 2>&1
if [ $? -eq 0 ] ; then
echo "ON"
exit 0
fi
echo "OFF"
exit 1
;;
*)
echo
echo "Usage: ${THIS_NAME} <on|off|status>"
echo
exit 1
;;
esac
exit 0