Search directory and subdirectories for file matching a string and listing paths using ls and grep instead of find

Question

I know there is a nice Linux program called find, which used as

find /home/user -name ".txt"

will print all the files with .txt extension with their relative path

How can I achieve the same using ls, grep and possibly awk?

I tried listing all files in directory and its subdirectories recursively using

ls -LR1

but have no idea how to parse it using grep.

Any advice would be greatly appraciated.

Answer 1

You can do this with bash4 and zsh :

shopt -s globstar # required if not enabled with bash4
printf '%s\n' **/*.txt

But don't trust anyone finding a solution with ls + awk, not the good way to achieve this with robustness