To use this program, you must feed it a list of filenames in this format:
dir
dir/file1.ext
dir/file2.exe
dir/dir2
dir/dir2/file3.ext
If the list does not include the directory-only lines (like dir/dir2) then their names will not be checked for uniqueness, else they will be. Typical uses of this program are like these:
find . -print | doschk
tar tf file.tar | doschk
If this program produces no output, then all your files are MS-DOS compatible. Any output messages are designed to be self-explanatory and indicate cases where the files will not transfer to MS-DOS without problems.