07-14-2016
The EOF character is from CP/M. (Where the directory only contained blocks but not the byte-length, so the end in the last block was marked with an EOF.)
Neither MS-DOS/FAT nor Unix need the EOF character. Early MS-DOS applications used it for compatibility with CP/M.
The LF (or NL) character should be appended to the last line of a Unix text file, like is appended to the previous lines. This is a convention. If missing, some text processing utilities could skip the last line or give a warning.
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LEARN ABOUT HPUX
ungetc_unlo
ungetc(3S) ungetc(3S)
NAME
ungetc() - push character back into input stream
SYNOPSIS
Obsolescent Interface
DESCRIPTION
inserts the character c (converted to an unsigned char) into the buffer associated with an input stream. That character, c, is returned by
the next call to (see getc(3S)) on that stream. A successful intervening call to a file positioning function with stream or erases all
memory of the inserted characters.
affects only the buffer associated with the input stream. It does not affect the contents of the file corresponding to stream.
One character of pushback is guaranteed.
If c equals EOF, does nothing to the buffer and returns EOF.
Obsolescent Interface
pushes character back into input stream.
APPLICATION USAGE
After is applied to a stream, the stream becomes byte-oriented (see orientation(5)).
RETURN VALUE
If successful, and return c and clear the end-of-file indicator for the stream. and return EOF if they cannot insert the character.
WARNINGS
is an obsolescent interface supported only for compatibility with existing DCE applications. New multithreaded applications should use
SEE ALSO
flockfile(3S), fseek(3S), fgetpos(3S), getc(3S), setbuf(3S), orientation(5), thread_safety(5).
STANDARDS CONFORMANCE
ungetc(3S)