Linux中条件语句

Linux中备份一个jar包，需要既判断进程是否停止，又判断文件是否存在

1. 进程停了，文件存在则备份

2.进程停了，文件不存在，无需备份

3. 进程在跑，停止进程；文件存在，将文件进行备份

4. 进程在跑，停止进程；文件不存在，无需备份

backup)
PID=$(ps -ef | grep ${APP_NAME} | grep -v grep | awk '{print $2}')
if [ -z "$PID" ] ;then
echo "${APP_NAME} is not running,will backup files"
if [ -e ${APP_NAME}];then
mv ${APP_HOME}/${APP_NAME} ${APP_HOME}/backup/${APP_NAME}-$(date +%Y%m%d%H%M%S)
else
echo "stop ${APP_NAME}"
kill -9 $PID
echo "will backup files..."
if [ -e ${APP_NAME}];then
mv ${APP_HOME}/${APP_NAME} ${APP_HOME}/backup/${APP_NAME}-$(date +%Y%m%d%H%M%S)

fi
;;

backup)
PID=$(ps -ef | grep ${APP_NAME} | grep -v grep | awk '{print $2}')
if [ -z "$PID" ] ;then
        echo "${APP_NAME} is not running,will backup files"
	if [ -e ${APP_NAME}];then
	mv ${APP_HOME}/${APP_NAME} ${APP_HOME}/backup/${APP_NAME}-$(date +%Y%m%d%H%M%S)
else
        echo "stop ${APP_NAME}"
        kill -9 $PID
        echo "will backup files..."
		if [ -e ${APP_NAME}];then
        mv ${APP_HOME}/${APP_NAME} ${APP_HOME}/backup/${APP_NAME}-$(date +%Y%m%d%H%M%S)

fi
;;

　　忽然又觉得为啥要先判断进程呢，先判断文件啊~~~~

文件存在，进程在，杀进程，备份文件

文件存在，进程不再，备份文件

文件不存在，无需操作

就少了一步

保存下

#!/bin/bash

#server 10.215.65.131

JAVA=/usr/java/jdk1.8.0_211-amd64/bin/java
APP_HOME=/opt/xxx/xxx-xxx
APP_NAME=xxx-xxx.jar
APP_PARAM="--spring.config.location=${APP_HOME}/application.properties"

case $1 in
start)
PID=$(ps -ef | grep ${APP_NAME} | grep -v grep | awk '{print $2}')
if [ -z "$PID" ] ;then
        echo "start ${APP_NAME}"
        nohup ${JAVA} -jar ${APP_HOME}/${APP_NAME} ${APP_PARAM} > ${APP_HOME}/catalina.out 2>&1  &
else
        echo "${APP_NAME} is running"
fi
;;

stop)
PID=$(ps -ef | grep ${APP_NAME} | grep -v grep | awk '{print $2}')
if [ -z "$PID" ] ;then
        echo "${APP_NAME} is not running"
else
        echo "stop ${APP_NAME}"
        kill -9 $PID
fi
;;

restart)
PID=$(ps -ef | grep ${APP_NAME} | grep -v grep | awk '{print $2}')
if [ -z "$PID" ] ;then
        echo "start ${APP_NAME}"
        nohup ${JAVA} -jar ${APP_HOME}/${APP_NAME} ${APP_PARAM}   > ${APP_HOME}/catalina.out 2>&1  &
else
        echo "stop ${APP_NAME}"
        kill -9 $PID
        echo "start ${APP_NAME}"
        nohup ${JAVA} -jar ${APP_HOME}/${APP_NAME} ${APP_PARAM}   > ${APP_HOME}/catalina.out 2>&1  &
fi
;;

backup)
PID=$(ps -ef | grep ${APP_NAME} | grep -v grep | awk '{print $2}')
if [ -z "$PID" ] ;then
        echo "${APP_NAME} is not running,will backup files"
	if [ -e ${APP_NAME}];then
	mv ${APP_HOME}/${APP_NAME} ${APP_HOME}/backup/${APP_NAME}-$(date +%Y%m%d%H%M%S)
else
        echo "stop ${APP_NAME}"
        kill -9 $PID
        echo "will backup files..."
		if [ -e ${APP_NAME}];then
        mv ${APP_HOME}/${APP_NAME} ${APP_HOME}/backup/${APP_NAME}-$(date +%Y%m%d%H%M%S)

fi
;;

logs)
tail -f ${APP_HOME}/catalina.out
;;

status)
PID=$(ps -ef | grep ${APP_NAME} | grep -v grep | awk '{print $2}')
if [ -z "$PID" ] ;then
        echo "${APP_NAME} is not running"
else
        echo "${APP_NAME} is running, pid $PID"
fi
;;

*)
echo "您输入的指令没有对应的方法哟"

esac