Bash中的百分比符号，它的作用是什么? [英] percent symbol in Bash, what's it used for?

问题描述

我有一个以.zip结尾的文件名，我只想要没有zip的文件名.在这里，我发现了bash的一个窍门.

I have a filename which ends with .zip and I wanted just the filename without zip. Here I found a trick in bash.

$f="05 - Means-End Analysis Videos.zip"
$echo "${f%*.zip}"
05 - Means-End Analysis Videos

这是怎么回事? %*.zip为何要删除我的扩展名?

What is happening here? How come %*.zip is removing my extension?

推荐答案

从开头删除$var中string的最短匹配项:

Delete the shortest match of string in $var from the beginning:

${var#string}

从开头删除$var中string的最长匹配项:

Delete the longest match of string in $var from the beginning:

${var##string}

从末尾删除$var中string的最短匹配项:

Delete the shortest match of string in $var from the end:

${var%string}

从末尾删除$var中string的最长匹配项:

Delete the longest match of string in $var from the end:

${var%%string}

尝试:

var=foobarbar
echo "${var%b*r}"
> foobar
echo "${var%%b*r}"
> foo

这篇关于Bash中的百分比符号，它的作用是什么?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！