swh-source/src/kr/co/swh/lecture/shellscript/example.sh

#!/bin/bash

BASE=/home/...	# 프로그램 루트경로

LIB=$BASE/lib
PID=$BASE/.pid
PSEXE="/bin/ps"

classpath()
{
	JARS=`ls $LIB/*.jar`
	for jar in $JARS
	do
		cp=$cp:$jar
	done
} 
classpath
export CLASSPATH=.:$CLASSPATH:$cp

checkRunning(){
	if [ -f "$PID" ]; then
		if  [ -z "`cat $PID`" ];then
			echo "ERROR: Pidfile '$PID' exists but contains no pid"
			return 2
		fi
		PID=`cat $PID | tail -1`
		RET=`$PSEXE -p $PID|grep java`
		if [ -n "$RET" ];then
			return 0
		else
			return 1
		fi
	else
		return 1
	fi
	return 1
}


invoke_start(){
	checkRunning
	retval=$?
    if [ "$retval" -eq 0 ];then
		PID=`cat $PID | tail -1`
		echo "already running (pid '$PID')"
		exit 0
	else
		exec java com.google.App &	# 프로그램 실행 (자바는 java 클래스파일)
		PID=`ps -ef | grep App | head -n1 |  awk ' {print $2;} '`	# grep 다음에 프로그램 이름
		echo ${PID} > ${PID}
    fi
}

invoke_stop(){
	checkRunning
	retval=$?
	if [ "$retval" -eq 0 ];then
		PID=`cat $PID | tail -1`
		kill -9 $PID
	else
		echo "already stop "
	fi
}

invoke_status(){
	checkRunning
	retval=$?
	if [ $retval -eq 0 ];then
		PID=`cat $PID | tail -1`
		echo "Program is running (pid '$PID')"
		exit 0
	fi
	echo "Program not running"
	exit 1
}


case "$1" in
	'start')
		invoke_start
		;;

	'stop')
		invoke_stop
		;;

	'status')
		invoke_status
		;;

	*)
		echo "Usage: $0 { start | stop | status }"
		exit 1
		;;
esac

exit 0