Shell 脚本学习笔记

杂记

括号的使用说明

参考：Double parenthesis with and without dollar

  • $(...) means execute the command in the parens and return its stdout. 
$ echo "The current date is $(date)"
The current date is Mon Jul  6 14:27:59 PDT 2015
  • (...) means run the commands listed in the parens in a subshell. Example:
$ a=1; (a=2; echo "inside: a=$a"); echo "outside: a=$a"
inside: a=2
outside: a=1
  • $((...)) means perform arithmetic and return the result of the calculation. Example:
$ a=$((2+3)); echo "a=$a"
a=5
  • ((...)) means perform arithmetic, possibly changing the values of shell variables, but don't return its result. Example:
$ ((a=2+3)); echo "a=$a"
a=5
  • ${...} means return the value of the shell variable named in the braces. Example:
$ echo ${SHELL}
/bin/bash
  • {...} means execute the commands in the braces as a group. Example:
$ false || { echo "We failed"; exit 1; }
We failed

有用脚本收集

文件读取

读取文件目录的所有文件，按行读取每个文件，判断行文字是否包含特定字符串；如果包含，通过特殊字符来split并输出想要的值。

#!/bin/sh
for filename in /home/okchem/mysqlbackup/*.sql; do
    while IFS= read line
    do
        # display $line or do somthing with $line
        if [[ $line == *"/ocf/"* ]]; then
            SUBSTRING=$(echo $line| cut -d'`' -f 2) # 用'`'来拆分,输出数组第二个
            echo $SUBSTRING
        fi
    done <"${filename}.sql"
done

自动build 发布到远程机器

#！ /bin/bash

currentPath=$(pwd)
echo "当前文件夹路径: $currentPath"


# 拉去git上最新数据
echo "start pull updates from remote"
git pull

echo "Start Building......"
npm run build

sftp root@10.3.69.41 <<EOT
put -r $currentPath/dist /home/nantong/0_125_Umi/
quit
EOT

简易发布Java Maven工程

#！ /bin/bash

## 修改这一个变量即可，修改为代码clone的那个文件夹
NAME=websocket-service

## 拉取代码、构建、复制jar、杀掉进程、运行
cd ${NAME}
git pull
mvn clean package -Dmaven.test.skip=true
cd ..
mv ${NAME}/target/*.jar ./${NAME}.jar

# 找出进程ID 
tokill=`ps -ef | grep java | grep ${NAME} | awk '{print $2}'`
kill -9 $tokill

nohup java -Dspring.profiles.active=dev -jar ${NAME}.jar > ./app.log 2>&1 &

远程发布脚本

远程运行脚本

deploy.sh

#！ /bin/bash

## 修改这一个变量即可，修改为代码clone的那个文件夹
NAME=websocket-service

# 找出进程ID 
tokill=`ps -ef | grep java | grep ${NAME} | awk '{print $2}'`
kill -9 $tokill

# 定位到当前脚本所在的目录
cd "$(dirname "$0")"
nohup java -Xms256m -Xmx512m  -jar ${NAME}.jar > ./app.log 2>&1 &
本地脚本

remote-deploy.sh

#！ /bin/bash

## 修改这一个变量即可，修改为代码clone的那个文件夹
NAME=websocket-service
scp websocket-service.jar root@remoteserver:/opt/icviews/websocket/ 
ssh root@remoteserver '/opt/icviews/websocket/deploy.sh'

参考网站

https://www.shellscript.sh/ https://www.shellscript.sh/quickref.html

最后更新于 3rd Nov 2022