linux 判断某个进程是否存在，存在则重启，不存在则启动。

++++++++++++++++++++++++++++++++++++ PIDS=`ps -ef|grep "app.js"|grep -v grep`

if [ "$PIDS" != "" ]; thenpm2 restart appecho "app restart!"elsepm2 start app.jsecho "app started"fi

+++++++++++++++++++++++++++++++++++

## 下面是node环境 webhook脚本配置

#!/bin/bash

export NODE_HOME=/usr/bin/nodeexport PATH=$NODE_HOME/bin:$PATHecho "++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++"cd /www/wwwroot/api/nodeApi/git reset --hard origin/mastergit clean -fgit pullPIDS=`ps -ef|grep "app.js"|grep -v grep`if [ "$PIDS" != "" ]; thenpm2 restart appecho "app restart!"elsepm2 start app.jsecho "app started"fipm2 show 0echo "----------------------------------------------------------------------------"