generic init.d service

#!/bin/sh
#
# 2013 Daniel Hilst Selli <daniel.hilst@csi.ind.br>
#

# Change this to start your service
# also, set ARGS on /etc/default/<SERVICE>
# as arguments to $PROG. Where SERVICE is the
# name of this script at /etc/init.d
PATH=/usr/bin:/bin:/sbin:/usr/sbin
PROG=foo

# Guessing the service script name. It is /etc/rcN.d/S20service
# while booting, and /etc/init.d/service if is interactively invocated
# On both cases I want service. sed, perl, awk are slow :-)
_nopath=${0##*/} # now we have S20service or service on $_nopath
SERVICE=${_nopath#[SK][0-9][0-9]} # and now service

PIDFILE=${PIDFILE:-/var/run/$SERVICE.pid} # Overwrite this on /etc/default/$SERVICE

if test -r /etc/default/$SERVICE; then
    . /etc/default/$SERVICE
fi

start()
{
    start-stop-daemon --background --make-pidfile --pidfile $PIDFILE --exec $PROG -S -- $ARGS
}

stop()
{
    start-stop-daemon --pidfile $PIDFILE --exec $PROG -K
}

status()
{
    if kill -0 $(cat $PIDFILE) > /dev/null 2>&1; then
        return 0
    else
        return 1
    fi
}

usage()
{
    echo "$0 {start|stop|status|restart}"
}

if test -z "$1"; then
    start
    exit 1
fi

case $1 in
    start)
        echo -n "Starting $SERVICE ... "
        start
        sleep 1
        if status; then
                echo "DONE"
        else
                echo "FAIL"
        fi
        ;;
    stop)
        echo -n "Stopping $SERVICE ... "
        stop > /dev/null 2>&1
        sleep 1
        if status; then
                echo "FAIL"
        else
                echo "DONE"
        fi
        ;;
    restart)
        stop
        sleep 2
        start
        status
        ;;
    status)
        echo -n "$SERVICE is ... "
        if status; then
                echo "STARTED"
        else
                echo "STOPPED"
        fi
        ;;
    *)
        usage
        exit 1
        ;;
esac

exit 0