BASH script to control tomcat instance on customized CATALINA_BASE with CATALINA_PID

gistfile1.sh

#!/bin/sh

usage () {
  echo "Usage: $0 <startup|shutdown>"
  exit 1
}

if [ $# -lt 1 ]
then
  usage
fi

INSTANCE_BASE=$(dirname $0)
INSTANCE_BASE=$(pwd -P $INSTANCE_BASE)
INSTANCE_BASE=${INSTANCE_BASE%%/bin}

export JAVA_HOME=/home/app/opt/jdk
export CATALINA_HOME=/home/app/opt/tomcat


export CATALINA_BASE=$INSTANCE_BASE
export CATALINA_PID=$CATALINA_BASE/logs/catalina.pid


if [ "$1" == "startup" ]
then
  $CATALINA_HOME/bin/startup.sh start
elif [ "$1" == "shutdown" ]
then
  $CATALINA_HOME/bin/shutdown.sh
else
  usage
fi