无论bash脚本中的大小写如何匹配文件扩展名

Question

Let's just say i want to match the .abc extension but it could come over as .ABC or .AbC . How can I identify all of these variations of the .abc extension in order to process .abc files?

Right now i'm using:

ls | grep -i .abc

but i've heard that piping to grep is usually not the best idea. Is there a better way to do this?

Answer 1

If you enter the extension literally, you can use character classes:

ls *.[Aa][Bb][Cc]

You can also use the -iname option of find :

find -maxdepth 1 -iname '*.abc'

Answer 2

You can use the nocaseglob option to the shopt builtin to make globs not pay attention to case.

$ touch foo.abc foo.ABC
$ echo *.abc
foo.abc
$ shopt -s nocaseglob
$ echo *.abc
foo.ABC foo.abc