LINUX shell脚本攻略

LINUX shell脚本攻略

 

  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\)  www.2cto.com  

 

   简单的判断例子

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#!/bin/bash

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if [ $UID ne 0 ];then

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 echo Non root user.Please run as root.

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else

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 echo "Root user"

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fi

      ....

  休息一会继续

  www.2cto.com  

       继续

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#!/bin/bash

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start=$(data +%s)

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commands;

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statements;

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end=$(data +%s)

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differenc=$((end - start))

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echo Time taken to execute commands is $difference seconds.