Home >Operation and Maintenance >Linux Operation and Maintenance >Detailed explanation of how to use the read command to obtain the value in a variable in Linux
对于写bash脚本的朋友,read命令是不可或缺的,需要实践一下就可以了解,下面这篇文章主要给大家介绍了关于linux如何利用read命令来获取变量中值的相关资料,文中通过示例代码介绍的非常详细,需要的朋友可以参考借鉴,下面来一起看看吧。
前言
本文主要给大家介绍了关于linux利用read命令获取变量中值的相关内容,分享出来供大家参考学习,下面话不多说了,来一起看看详细的介绍吧。
read的常用用法如下:
read -[pstnd] var1 var2 ...
-p提示语句
-n 字符个数
-s 屏蔽回显
-t 等待时间
-d 输入分界
read来获取变量,是通过屏幕中等待用户输入的,如果是用read命令从已知的变量来获取值要如何操作呢?
比如说: input_ips='127.127.127.10-127.127.127.14',通过read命令分别读取到start_ip, end_ip两个变量中?
方法一:
root@linux~# input_ips='127.127.127.10-127.127.127.14' root@linux~# read start_ip end_ip < <(echo $input_ips | awk -F'-' '{print $1, $2}') root@linux~# echo -e "START_IP=$start_ip; END_IP=$end_ip" START_IP=127.127.127.10; END_IP=127.127.127.14
方法二:
root@linux~# input_ips='127.127.127.10-127.127.127.14' root@linux~# read start_ip end_ip <<-EOF > `echo $input_ips | awk -F'-' '{print $1, $2}'` > EOF root@linux~# echo -e "START_IP=$start_ip; END_IP=$end_ip" START_IP=127.127.127.10; END_IP=127.127.127.14
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