. SH scripting

  ○ scripting
    ■ To write .sh Script for
      ● Put us in linux The commands executed in are written into the script
      ● first line #! /bin/bash Specifies the interpreter for the script /bin/bash
    ■ Execute the script
      ● Parser   Script
        ○ Execute the script directly through the interpreter
          ■ /bin/bash
          ■ sh
          ■ source Execute the script through this interpreter , Will affect the current environment     、
      ● Give permissions to scripts
        ○ ./ Script name is enough
      ● skill
        ○ Variable definitions
          ■ name= value
          ■ quote
            ● $ Variable name
            ● ${ Variable name }
        ○ Assign a value to the result of command execution
          ■ The quotation marks ``
            ● path=`pwd`
        ○ The ginseng
          ■ Separate multiple parameters with spaces after the script
          ■ To obtain parameters $n To get the specified parameters

eg:

Open in the background springboot Project script

#！/bin/bash

nohup java -jar test_web-0.0.1-SNAPSHOT.jar &

close spring project

#! /bin/bash

pid=`ps aux | grep test_web-0.0.1-SNAPSHOT.jar | grep java | sed 's/\s\+/\t/g' \
| cut -f 2`
echo $pid

if [ ! $pid  ];then
        echo " The service has not been started "
else
        kill -9 $pid
        echo " The service has stopped "
fi