Linux crontab定时执行Shell脚本需要执行特定的命令时解决思路

* * * * * cd /项目目录 && ./auto_start.sh  /log/auto.out

#!/bin/bash 
#导入环境变量 
export LANG="en_US.UTF-8" 
export JAVA_HOME=/usr/local/java
export CLASSPATH=$JAVA_HOME/lib
export PATH=$PATH:$JAVA_HOME/bin
APP_NAME=app
JAR_NAME=app.jar
Log="log.out"
JVM="-server -Xms1024m -Xmx1024m -Xmn256m -Xss512k -XX:MetaspaceSize=128m -XX:MaxMetaspaceSize=128m"
pid=$(ps -ef | grep -v 'grep' | egrep $JAR_NAME| awk '{printf $2 " "}')
if [ "$pid" != "" ]; then
  echo "boot ( pid $pid) is running"
else
 echo -n "auto_start process pid: "
  nohup java $JVM -jar $JAR_NAME --spring.profiles.active=dev > $Log 2>&1 &
  echo $(ps -ef | grep -v 'grep' | egrep $JAR_NAME| awk '{printf $2 " "}')
fi