End Of File
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
Unixterminal driver into an end-of-file condition.
(1995-01-18)