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EOF

   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. [UNIX] The
   keyboard character (usually control-D, the ASCII EOT (End Of
   Transmission) character) that is mapped by the terminal driver into
   an end-of-file condition.  3. Used by extension in non-computer
   contexts when a human is doing something that can be modeled as a
   sequential read and can't go further.  "Yeah, I looked for a list
   of 360 mnemonics to post as a joke, but I hit EOF pretty fast; all
   the library had was a JCL manual."  See also
   EOL.