Bash script to control fluentd daemon

fluent.sh

#!/bin/bash

FLUENT_HOME=PLACEHOLDER_PATH
PID_FILE=$FLUENT_HOME/fluent.pid
CONF_FILE=$FLUENT_HOME/config/fluent.conf
PLUGIN_PATH=$FLUENT_HOME/config/plugin
LOG_FILE=$FLUENT_HOME/log/fluent.log
PSNAME="fluentd --daemon"

F_USER=PLACEHOLDER_USERNAME
F_GROUP=PLACEHOLDER_GROUP

start()
{
        PID=`pgrep -f "$PSNAME"`
        if [ -z "$PID" ]; then
                if [ -f $PID_FILE ]; then rm -f $PID_FILE; fi
        else
                echo "fluentd already started."
                return 1
        fi
        echo -n "Starting fluentd: "
        # Check if the user and group exist
        getent passwd $F_USER > /dev/null 2>&1
        VALID_USER=$?
        getent group $F_GROUP > /dev/null 2>&1
        VALID_GROUP=$?

        if [ $VALID_USER -ne 0 ] ; then echo "User $F_USER doesnt exist. Please double check your configuration"; exit 1; fi
        if [ $VALID_GROUP -ne 0 ] ; then echo "Group $F_GROUP doesnt exist. Please double check your configuration" ; exit 1; fi

        # Load user change options if the target user/group doesnt match the current user/group
        USER_OPTS=""
        if [ ! $F_USER == `whoami` ] ; then USER_OPTS=$USER_OPTS"--user $F_USER " ; fi
        if [ ! `id -g -n $F_USER` == $F_GROUP ] ; then USER_OPTS=$USER_OPTS"--group $F_GROUP"; fi


        # Execute fluent
        nice $PSNAME $PID_FILE $USER_OPTS --config $CONF_FILE --log $LOG_FILE -p $PLUGIN_PATH -v
        echo "done."
}

stop()
{
        PID=`pgrep -f "$PSNAME"`
        if [ -z "$PID" ]; then
                echo "fluentd already stopped."
                return 0
        fi
        echo -n "Stopping fluentd: "
        pkill -TERM -f "$PSNAME"
        count=0
        while [ ! -z "$PID" ]; do
                count=`expr $count + 1`
                if [ `expr $count % 10` -eq 0 ]; then pkill -KILL -f "$PSNAME"; fi
                if [ $count -eq 60 ]; then
                        echo " failed."
                        return 1
                fi
                sleep 1
                PID=`pgrep -f "$PSNAME"`
        done
        echo "done."
}

restart()
{
        stop && start
}

case "$1" in
        start)
                start
                ;;
        stop)
                stop
                ;;
        restart)
                restart
                ;;
        reload)
                pkill -HUP -f "$PSNAME"
                ;;
        flush)
                pkill -USR1 -f "$PSNAME"
                ;;
        *)
                echo "Usage: $0  {start|stop|restart|reload|flush}"
                exit 1
                ;;
esac

exit $?