[from the comp.unix.shell group on Usenet] Stands for Useless Use of {cat}; the reference is to the Unix command cat(1), not the feline animal. As received wisdom on comp.unix.shell observes, "The purpose of cat is to concatenate (or `catenate') files. If it's only one file, concatenating it with nothing at all is a waste of time, and costs you a process." Nevertheless one sees people doing cat file | some_command and its args ... instead of the equivalent and cheaper <file some_command and its args ... or (equivalently and more classically) some_command and its args ... <file Since 1995, occasional awards for UUOC have been given out, usually by Perl luminary Randal L. Schwartz. There is a web page devoted to this and other similar awards.