标签：hint info print 查看系统 bash mem err bsh stat
shell脚本中case选择语句可以结合read指令实现比较好的交互应答操作，case接收到read指令传入的一个或多个参数，然后case根据参数做选择操作。
case的语法如下
case $char in C | c ) command 1 ;; #每一个选择都以双 ;; 结束 M | m ) command 2 ;; * ) # * 未匹配到相符的其他值 echo “error” ;; esac #case的结束语句是以esac 结束
下面结合一个简单的小功能使用，脚本中同时也用到了函数的方法；简单查看系统信息
#!/bin/bash echo "check system run status" echo "show CPUinfo: C/c " echo "show Memery used: M/m " echo "show Disk use status: D/n " echo "show System user login: U/n " echo "show System load average:L/l" echo "show System Ip address: I/i" read_input () { read -t 10 -p "please Input C/M/D/U/L/I : " char } show_status () { case $char in C | c ) cat /proc/cpuinfo | grep -o -i ‘model name.*‘ ;; M | m ) free -m ;; D | d ) df -h ;; U | u ) w ;; L | l ) top | head -1 | cut -d " " -f 11-15 ;; I | i ) ifconfig | grep -o "[0-9.]\{7,\}" | head -1 ;; * ) echo "The characters you have entered are wrong. Please look at the hints" ;; esac } for i in $( seq 1 10) do read_input show_status if [ $i -eq 10 ]; then echo "已经到达查询的最大次数，脚本退出;" fi done
看看测试结果
[root@yufu home]# ./test.sh check system run status show CPUinfo: C/c show Memery used: M/m show Disk use status: D/n show System user login: U/n show System load average:L/l show System Ip address: I/i please Input C/M/D/U/L/I : The characters you have entered are wrong. Please look at the hints please Input C/M/D/U/L/I : m total used free shared buffers cached Mem: 1869 165 1703 0 21 48 -/+ buffers/cache: 96 1773 Swap: 1999 0 1999 please Input C/M/D/U/L/I : c model name : Intel(R) Core(TM) i5-3317U CPU @ 1.70GHz model name : Intel(R) Core(TM) i5-3317U CPU @ 1.70GHz please Input C/M/D/U/L/I :
这样可以实现交互式地传递参数，并且通过循环可以设置选择次数，通过read -t 限制等待输入时长等
标签：hint info print 查看系统 bash mem err bsh stat
原文地址：https://www.cnblogs.com/anay/p/8824089.html
