Linux shell编程字符串比较语法 [英] Linux shell programming string compare syntax

问题描述

= 和 == 之间有什么区别来比较Linux shell编程中的字符串？

What is the difference between = and == to compare strings in Linux shell programming?

也许下面的代码可以工作：

Maybe the following code works:

if [ "$NAME" = "user" ]
then
    echo "your name is user"
fi

但我认为这不是一个正确的语法。它将用于比较 == 语句的字符串。

But I think it's not a correct syntax. It would be used to compare string by == statement.

什么是正确的？

推荐答案

Googlebash compare strings： http://www.google.com/search?q=bash%20compare%20字符

Google "bash compare strings": http://www.google.com/search?q=bash%20compare%20strings

• http://www.tech-recipes.com/rx/209/bournebash-shell- scripts-string-comparison /


• http：/ /tldp.org/LDP/abs/html/comparison-ops.html


• http://www.faqs.org/docs/Linux-HOWTO/Bash-Prog-Intro-HOWTO.html#ss11.2

• http://www.tech-recipes.com/rx/209/bournebash-shell-scripts-string-comparison/
• http://tldp.org/LDP/abs/html/comparison-ops.html
• http://www.faqs.org/docs/Linux-HOWTO/Bash-Prog-Intro-HOWTO.html#ss11.2

这不难吗？

我链接的第二页，你会发现：

Also, as on the second page I linked, you will find:

==

    is equal to

    if [ "$a" == "$b" ]

    This is a synonym for =.

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