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I am looking for file "WSFY321.c" in a huge directory hierarchy.
Usually I would use GNU find: find . -name "WSFY321.c"
But I do not know the case, it could be uppercase, lowercase, or a mix of both.

What is the easiest way to find this file?
Is there something better than find . | grep -i "WSFY321.c" ?

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up vote 89 down vote accepted

Recent versions of GNU find have an -iname flag, for case-insensitive name searches.

find . -iname "WSFY321.c"
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Also, since you're specifically looking for a file you can probably shave another couple of ticks off that with the -type f flag so it won't bother looking at the name if the inode is a directory. But that's pedantic levels of optimization... – Shadur Feb 20 '12 at 9:47
For working with some regex you can do find . -iname \*WSFY321.c\* -type f – Benj Jun 11 at 22:01

With GNU find, or other versions of find that have it:

find . -iname 'WSFY321.c'

With other versions:

find . -name '[Ww][Ss][Ff][Yy]321.[Cc]'

Or a compromise that's slower but easier to type:

find . -name '????321.c' | grep -i '/WSFY[^/]*$'

Or in zsh:

print -rl -- **/(#i)WSFY321.c
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@Gilles The grep version is filtering only upper case, and I don't understand the '[^/]' ..(not /) – Peter.O Feb 20 '12 at 6:22
@Gilles What is the argument to use the single quotes in the first case (exact filename) over no quotes at all? – Bernhard Feb 20 '12 at 7:14
@Peter.O No * after the / in the bash version. I meant grep -i. I use [^/]* rather than .* so as not to catch files in directories whose name begins with WSFY. – Gilles Feb 20 '12 at 10:08
@Bernhard Consistency. – Gilles Feb 20 '12 at 10:08
Thanks Gilles: I deleted the previous comment with incorrect syntax, and tested the ammended version, but it doesn't work without the * (for an unexpected reason; to me at least).  The case-insensitive option no longer works: shopt -s extglob nocaseglob globstar; printf '%s\n' **/WSFY321.c ... I suppose that's why it is called a nocase‍​ glob: it only works in the context of a glob (or so it seems). – Peter.O Feb 20 '12 at 11:34

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