sample-etc_rc.d_init.d_ddclient

#!/bin/bash
#
# ddclient      This shell script takes care of starting and stopping
#               ddclient.
#
# chkconfig: 2345 65 35
# description: ddclient provides support for updating dynamic DNS services.

CONF=/etc/ddclient/ddclient.conf
program=ddclient

[ -f $CONF ] || exit 0

system=unknown
if [ -f /etc/fedora-release ]; then
    system=fedora
elif [ -f /etc/redhat-release ]; then
    system=redhat
elif [ -f /etc/debian_version ]; then
    system=debian
fi

PID=''
if [ "$system" = "fedora" ] || [ "$system" = "redhat" ]; then
    . /etc/init.d/functions
    PID=`pidofproc $program`
else
    PID=`ps -aef | grep "$program - sleep" | grep -v grep | awk '{print $2}'`
fi

PATH=/usr/bin:/usr/local/bin:${PATH}
export PATH

# See how we were called.
case "$1" in
    start)
        # See if daemon=value is specified in the config file.
        # Assumptions:
        #   * there are no quoted "#" characters before "daemon="
        #     (if there is a "#" it starts a comment)
        #   * "daemon=" does not appear in a password or value
        #   * if the interval value is 0, it is not quoted
        INTERVAL=$(sed -e '
              s/^\([^#]*[,[:space:]]\)\{0,1\}daemon=\([^,[:space:]]*\).*$/\2/
              t quit
              d
              :quit
              q
            ' "$CONF")
        if [ -z "$DELAY" ] || [ "$DELAY" = "0" ]; then
            DELAY="-daemon 300"
        else
            # use the interval specified in the config file
            DELAY=''
        fi
        echo -n "Starting ddclient: "
        if [ "$system" = "fedora" ] || [ "$system" = "redhat" ]; then
            daemon $program $DELAY
        else
            ddclient $DELAY
        fi
        echo
        ;;
    stop)
        # Stop daemon.
        echo -n "Shutting down ddclient: "
        if [ -n "$PID" ]; then
            if [ "$system" = "fedora" ] || [ "$system" = "redhat" ]; then
                killproc $program
            else
                kill $PID
            fi
        else
            echo "ddclient is not running"
        fi
        echo
        ;;
    restart)
        $0 stop
        $0 start
        ;;
    status)
        if [ "$system" = "fedora" ] || [ "$system" = "redhat" ]; then
            status $program
        else
            if test "$PID"; then
                for p in $PID; do
                    echo "$program (pid $p) is running"
                done
            else
                echo "$program is stopped"
            fi
        fi
        ;;
    *)
        echo "Usage: ddclient {start|stop|restart|status}"
        exit 1
esac

exit 0