Question

I’m trying to make a script that will go into a directory and run my own application with each file matching a regular expression, specifically Test[0-9]*.txt.

My input filenames look like this TestXX.txt. Now, I could just use cut and chop off the Test and .txt, but how would I do this if XX wasn’t predefined to be two digits? What would I do if I had Test1.txt, …, Test10.txt? In other words, How would I get the [0-9]* part?

Just so you know, I want to be able to make a OutputXX.txt 🙂

EDIT:

I have files with filename Test[0-9]*.txt and I want to manipulate the string into Output[0-9]*.txt

Answer 1

Would something like this help?

#!/bin/bash
for f in Test*.txt ;
do
    process < $f > ${f/Test/Output}
done

Bash Shell Parameter Expansion