Seriously. There doesn’t seem to be a way to do this. Every thing I ever try I just get bad substitution errors. The internet is full of people posting code that’s supposed to compare file extensions but none of it works. I’ve spent all morning trying everything I could find. I already gave up and I’m making this progeam in python instead but now I’m curious. How tf do you actually compare file extensions? If I have a folder fill of files and I want to run a command only on the png files, there seems to be no way to actually do this.
If someone posts “[[ $file == *.txt ]]” I’m going to fucking scream because THAT DOES NOT WORK. IT’S NOT VAILD BASH CODE.
ls | grep txt$will return only files ending “txt”What’s the purpose of a pipe and an execution of “grep” here?
lsreturns a list of files, the pipe passes that list to grep. The grep only returns results that match the stringtxt$. The$symbol represents an end of line.That’s my bad, I asked an incomplete question.
What does the approach of spawning a grep process and having ls send ALL of it’s output to grep have over just passing a glob to ls?
Like:
$ ls /usr/share/*.lm /usr/share/out-go.lm /usr/share/ril.lm /usr/share/rlhc-crack.lm /usr/share/rlhc-d.lm /usr/share/rlhc-java.lm /usr/share/rlhc-julia.lm /usr/share/rlhc-ocaml.lm /usr/share/rlhc-rust.lm /usr/share/ragel.lm /usr/share/rlhc-c.lm /usr/share/rlhc-csharp.lm /usr/share/rlhc-go.lm /usr/share/rlhc-js.lm /usr/share/rlhc-main.lm /usr/share/rlhc-ruby.lmTbh, I didn’t even realise you could do that. I’m just used to using grep and worked backwards. Thanks for pointing it out.
It would also return non-file objects, like directories