Bash 中的百分比符号，它是做什么用的？
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percent symbol in Bash, what's it used for?
提问by Senthil Kumaran
I have a filename which ends with .zipand I wanted just the filename without zip. Here I found a trick in bash.
我有一个以 结尾的文件名，.zip我只想要没有 zip 的文件名。在这里，我在 bash 中找到了一个技巧。
$f="05 - Means-End Analysis Videos.zip"
$echo "${f%*.zip}"
05 - Means-End Analysis Videos
What is happening here? How come %*.zipis removing my extension?
这里发生了什么？为什么要%*.zip删除我的扩展程序？
回答by pfnuesel
Delete the shortest match of stringin $varfrom the beginning:
从头开始删除stringin的最短匹配项$var：
${var#string}
Delete the longest match of stringin $varfrom the beginning:
从头开始删除stringin的最长匹配项$var：
${var##string}
Delete the shortest match of stringin $varfrom the end:
从末尾删除stringin的最短匹配项$var：
${var%string}
Delete the longest match of stringin $varfrom the end:
从末尾删除stringin的最长匹配项$var：
${var%%string}
Try:
尝试：
var=foobarbar
echo "${var%b*r}"
> foobar
echo "${var%%b*r}"
> foo
