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That's why I suggested nawk on other systems.

Or gawk, if you have it.

What a strange application. Oh well.

What's your system? This will be simple enough if you have GNU awk:

find /path -name '*.txt' | awk -F"/" -v OFS="/" '{$NF=toupper($NF)} 1' nawk may have...

You can use tr for that.

find ./ -name '*.txt' | tr '[a-z]' '[A-Z]' ...though why you'd want to, I have no idea -- UNIX file names allow mixed cases and are case sensitive, meaning the actual name...

you could do:


#!/usr/bin/env bash
find ... | while IFS= read -r file; do
upper=$(nawk ... <<< "$file")
echo mv "$file" "$upper"
done


if that looks good, remove the echo