单分支:
#!/bin/bash rate=$(df -h|grep vg_andon-lv_root |awk '{print $5}'| cut -d "%" -f1) #echo $rate if [ $rate -ge 8 ] then echo "root partition is full" fi
双分支:
#!/bin/bash status=$(nmap -sT 192.168.69.20 |grep tcp | grep '<http>' |awk '{print $2 }') ##扫描远程目标机器开启的服务 若用ps 或者netstat不准确,会出现进行还在但是D住的状态 echo $status if [ $status == open ] then echo "apache is running at $(date)" >> /root/apache-acc.log else service httpd start & > /dev/null echo "apache is restarting at $(date)" >> /root/apache-err.log fi
多分支:
read -p "please input filename:" file if [ -z $file ] then echo "your input is null" exit 1 elif [ ! -e $file ] then echo "file not exist" exit 2 elif [ -f $file ] then echo 'file is file' elif [ -d $file ] then echo 'file is directory' else echo "file is other " fi