End Of File 1. The out-of-band value returned by C' s sequeNTial character-input functions (and their equivaleNTs in other environmeNTs) when end of file has been reached. This value is -1 under C libraries postdating V6 Unix, but was originally 0. 2. The keyboard character (usually coNTrol-D, the ASCII EOT (End Of Transmission) character) that is mapped by the Unix terminal driver iNTo an end-of-file condition. [Jargon File] (1995-01-18)