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:
 while {[gets $fp line]>=0} {...}
instead of
 while {![eof $fp]} {
    gets $fp line
    if [eof $fp break] ;# otherwise loops one time too many
    ...
 } ;# RS  

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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