Freebsd Daemonize script

daemonize.sh

#!/bin/sh
#
# Usage: daemonize.sh <pidfile> <exec> [<args>]
#
# Can be run from a cron job, will only trigger a single daemon to run
# and should restart the child daemon process if it fails.

usage() {
  awk '/# Usage/{ x=1 } x==1 { print $0 } !/^#/ && x==1 { exit 0 }' $0 >&2
  exit 2
}

if [ $# -lt 2 ]
then
        usage
fi

PIDFILE="$1"
shift
EXEC="$1"
shift

if [ ! -e "$PIDFILE" ]
then
        daemon -P "$PIDFILE" "$EXEC" $@
        exit 0
else
        exit 1
fi

Coudn't one use FreeBSD's daemon?