SHELL

bash loop over files in directory

#!/bin/bash
for filename in /Data/*.txt; do
    ...
done

bash loop over files in file

# Basic syntax:
for filename in `cat file_of_filenames.txt`; do
	echo $filename
done

# This iterates through each of the filenames listed in the 
#	file_of_filenames.txt
# Note, the filenames should be separated by spaces or new-lines

bash loop over files with extension

for i in *.java; do
    [ -f "$i" ] || break
    ...
done