Have you ever downloaded a file that didn’t have an extension? (I have…) But here’s a new tool for your toolkit. The file command tries to guess what kind of file you pass to it using some signature features of common file types. Check the man page (man file) in your friendly local terminal emulator for more.
theniftyfifties: “‘More time to enjoy your friends… more ways to enjoy your leisure”… Coca Cola advertisement, 1957
theniftyfifties: Grace Kelly