Question

I have a file folders.txt

one
two
three
four
...

that has a list of folder names. [one, two, three and four are names of folders].

Each of these folders has a number of files of different types (different extensions). I want a list of all the files in all the folders of one particular extension, say .txt.

How should my shell script look like?

Answer 1

Given the post is simply asking for a list of files, it’s quite simple:

tmp=$IFS
IFS=$(echo -en "\n\b") 
for i in `cat folders.txt` ; do
    ls -l "$i/*.txt"
done
IFS=$tmp