好吧，我们还是看书吧….
echo Hello world ! 等价于 echo ‘Hello world !’ 但是不等价于echo “Hello world !”(!放在双引号里边的时候需要转义\)
简单的判断例子
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#!/bin/bash if [ $UID ne 0 ];then echo Non root user.Please run as root. else echo "Root user" fi |
….
休息一会继续
继续
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#!/bin/bash start=$(data +%s) commands; statements; end=$(data +%s) differenc=$((end - start)) echo Time taken to execute commands is $difference seconds. |
时间：2012-12-10 21:07:27
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