cpverify verifies that a file or directory structure has been copied or burned without errors. That is, the copied file(s) is exactly the same as the original. This is done by calculating a cryptographic checksum using the md5 message-digest algorithm on each file from the source and the copy destination. The checksums for each file are then compared. Any difference indicates that the copied file is not the same as the original source file. Name of the file that fail to match the original source file is printed to stdo. Initially this script was written to verify that a CD ROM backup has been burned error free. Currently the script can verify whole directory trees as well as single files.