file: A file type guesser file: A command-line tool that tells you in words what kind of data a file contains. file: Unlike most GUI systems, command-line UNIX systems - with this program leading file: the charge - don't rely on filename extentions to tell you the type of a file, file: but look at the file's actual contents. This is, of course, more reliable, file: but requires a bit of I/O. file: file: Package maintainer: Felipe Sanchez file: