Shell入门之嵌套if条件

形式：if...then...[elif...then]...else...fi语法格式：if command | conditionthencommandselif command | condtioncommandsthencommandselsecommandsfi代码示例：#!/bin/bash# grep -v 过滤掉包含grep子进程if ps -ef | grep nginx | g

AllardZhao

5764人浏览 · 2021-12-10 00:16:28

AllardZhao · 2021-12-10 00:16:28 发布

形式：if...then...[elif...then]...else...fi

语法格式：

if command | condition
then
    commands
elif command | condtion
    commands
then
    commands
else
    commands
fi

代码示例：

#!/bin/bash

# grep -v 过滤掉包含grep子进程
if ps -ef | grep nginx | grep -v grep &> /tmp/null
then
	echo "Nginx is Running"
elif ps -ef | grep httpd | grep -v grep &> /tmp/null
then
	echo "Apache httpd is Running"
else
	echo "Nginx and Httpd is all Stopped"
fi

# 运行结果
～ % sh 04.if_then_else.sh
Nginx and Httpd is all Stopped