sonya$ ./full.pl -d /home/sonya/test/ -m file
Files to process: 3
Processing 1 of 3 files: file1.txt+
OK: Sorted file1.txt
Processing 2 of 3 files: file2.txt+
OK: Sorted file2.txt
Processing 3 of 3 files: file3.txt+
OK: Sorted file3.txt
sonya$ diff /home/sonya/test/file1.txt /home/sonya/test/sorted/file1.txt.sort 
sonya$
sonya$