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#!/bin/bash
# bash >= v.4
shopt -s globstar  # Must enable globstar, otherwise ** doesn't work.

echo "Using *"; echo
for filename in *
do
  echo "$filename"
done   # Lists only files in current directory ($PWD).

echo; echo "--------------"; echo

echo "Using **"
for filename in **
do
  echo "$filename"
done   # Lists complete file tree, recursively.

exit

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Using *

allmyfiles
filelist.bash4

--------------

Using **

allmyfiles
allmyfiles/file.index.txt
allmyfiles/my_music
allmyfiles/my_music/me-singing-60s-folksongs.ogg
allmyfiles/my_music/me-singing-opera.ogg
allmyfiles/my_music/piano-lesson.1.ogg
allmyfiles/my_pictures
allmyfiles/my_pictures/at-beach-with-Jade.png
allmyfiles/my_pictures/picnic-with-Melissa.png
filelist.bash4