End Of File 1. The out-of-band value returned bYC' 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)