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
environment « environment variable « Envoy « EOF
» EOL » EOT » EOU