Boot bash script to launch SpringBoot executable JARs

boot.sh

#!/bin/bash

usage="boot <JAR file name> <start|stop|restart>"

startProcess() {
        echo "Starting JAR ${jar_filename}"
        process_pid=`pgrep -f "^java.*${jar_filename}"`
        if [[ ${process_pid} ]]
        then
                echo "JAR is already running with PID ${process_pid}. Stop it before starting or restart it."   
                exit -1
        fi
        java -jar ${jar_filename} &
        sleep 5
        echo "JAR started"
}

stopProcess() {
        echo "Stopping JAR ${jar_filename}"
        process_pid=`pgrep -f "^java.*${jar_filename}"`
        if ! [[ ${process_pid} ]]
        then
                echo "No JAR ${jar_filename} is executing."
                exit -1
        fi
        kill -9 ${process_pid}
        echo "JAR stopped"
}

if [[ ${#} -lt 1 ]]
then
        echo ${usage}
        exit -2
fi

jar_filename=$1
boot_command=$2

case $boot_command in
        -start|start)
                startProcess
                ;;
        -stop|stop)
                stopProcess
                ;;
        -restat|restart)
                echo "Restarting JAR ${jar_filename}"
                stopProcess
                startProcess
                ;;
        *)
                echo ${usage}
                exit -2
esac
exit 0