12-29-2011
FWIW--
EOF is kind of the de facto choice for this. Old timers like me prefer the bang, !
Any character(s) not part of a command script are great choices. The trailing EOF or whatever MUST BE IN COLUMN 1 -- the leftmost column.
This User Gave Thanks to jim mcnamara For This Post:
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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)