shell编程：命令替换的运用

命令替换，有两种方式

方式一：`command`

方式二：$(command)

 

user.sh

查找系统中所有的用户，并且输出

#!/bin/bash

nginx=`netstat -tnlp | grep 80 | grep nginx | wc -l`

if [ "$nginx" -gt 0 ];then

echo "Nginx is running..."

else

echo "Nginx is stopped"

/application/nginx/sbin/nginx

fi

weeks.sh

今年过了多少周，剩下多少周

#!/bin/bash

nginx=`netstat -tnlp | grep 80 | grep nginx | wc -l`

if [ "$nginx" -gt 0 ];then

echo "Nginx is running..."

else

echo "Nginx is stopped"

/application/nginx/sbin/nginx

fi

nginx_check.sh

nginx服务进程检查脚本，检查到nginx停止服务立即重启

#!/bin/bash

nginx=`netstat -tnlp | grep 80 | grep nginx | wc -l`

if [ "$nginx" -gt 0 ];then

echo "Nginx is running..."

else

echo "Nginx is stopped"

/application/nginx/sbin/nginx

fi