nfsd_stats init.d script

#!/bin/sh
#
# nfsd_stats - script to start/stop nfsd_stats daemon
#
# chkconfig:   2345 99 10
# description: daemon to dump nfsd_stats.log statistics to InfluxDB
#              (requires telegraf)
# processname: nfsd_stats
# pidfile:     /var/run/nfsd_stats.pid

# Source function library.
. /etc/rc.d/init.d/functions

nfsd_stats=/usr/local/bin/nfsd_stats
prog=${nfsd_stats##*/}

pidfile="/var/run/$prog.pid"

start()
{
    local st

    if st=$( status ); then
        echo "$st"
        return
    fi
    [ -x $nfsd_stats ] || exit 5
    echo -n "Starting $prog: "
    $nfsd_stats <&- >&- 2> /var/run/$prog.stderr &
    sleep 3
    if kill -0 $! 2> /dev/null; then
        echo success
        echo $! > $pidfile
    else
        echo failed
    fi
}

stop()
{
    local st

    if ! st=$( status ); then
        echo "$st"
        return
    fi
    echo -n "Stopping $prog: "
    pkill -P $( cat $pidfile )
    if [ $? -eq 0 ]; then
        echo killed
    else
        echo failed
    fi
}

status()
{
    local pid

    if pid=$( cat $pidfile 2> /dev/null ) &&
       pgrep -P $pid telegraf > /dev/null
    then
        echo "$prog is running (pid $pid)"
    else
        echo "$prog not running"
        return 1
    fi
}

case "$1" in
start|stop|status) $1 ;;
restart) stop && sleep 3 && start ;;
*)
    echo "Usage: $0 {start|stop|restart|status}"
    exit 2
esac