eof is, in one sense, a command:

http://purl.org/tcl/home/man/tcl8.4/TclCmd/eof.htm

and, in another sense, an acronym for ''End Of File''.
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Programmers can use eof to determine whether the channel has reached the
end of input.

Note that it fires only after the last successful [gets], so testing for a -1 return value on gets may be a better idea, and avoid eof's
[FMM]
[http://starbase.neosoft.com/~claird/comp.lang.tcl/fmm.html#eof] by coding:
 while {[gets $fp line]>=0} {...}
instead of
 while {![eof $fp]} {
    gets $fp line
    if [eof $fp break] ;# otherwise loops one time too many
    ...
 } ;# RS  
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Hmmm... the only thing I find eof good for is as a condition
which should trigger closing a socket.

That is, if you are trying to read a non-blocking socket and
you hit eof, you KNOW that it's time to close the socket.

'''-PSE'''
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Can anyone indicate whether there are certain types of channels (pipe, socket, etc.) where eof doesn't do what one might at first blush expect?









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