Linux Shell教程（一） / 字符串运算符

2022-05-09 10:08| 来源: 网络整理| 查看: 265

字符串运算符

来看一个例子：

#!/bin/sh a="abc" b="efg" if [ $a = $b ] then echo "$a = $b : a is equal to b" else echo "$a = $b: a is not equal to b" fi if [ $a != $b ] then echo "$a != $b : a is not equal to b" else echo "$a != $b: a is equal to b" fi if [ -z $a ] then echo "-z $a : string length is zero" else echo "-z $a : string length is not zero" fi if [ -n $a ] then echo "-n $a : string length is not zero" else echo "-n $a : string length is zero" fi if [ $a ] then echo "$a : string is not empty" else echo "$a : string is empty" fi

运行结果：

abc = efg: a is not equal to b abc != efg : a is not equal to b -z abc : string length is not zero -n abc : string length is not zero abc : string is not empty

附：字符串运算符列表

字符串运算符列表

修改范例脚本中的变量为a="abc"，b="abcd"，编写并运行范例脚本。

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