't' - TEST FILES IN ARCHIVE(S) The test command is used to test the integrity of files in archives. This is done by extracting the file data and throwing it away (i.e. no files are created). If no file names are specified on the command line, then all files in the archive(s) are tested; otherwise, only the specified files are tested. If any of the tested files are corrupted, or a problem is encountered in any archive(s), LZX will exit with an error code.