eof
eof - test a filehandle for its end
eof FILEHANDLE
eof ()
eof
Returns 1 if the next read on FILEHANDLE will return end of file, or if
FILEHANDLE is not open. FILEHANDLE may be an expression whose value
gives the real filehandle name. (Note that this function actually
reads a character and then ungetc()s it, so it is not very useful in an
interactive context.) Do not read from a terminal file (or call
eof(FILEHANDLE)
on it) after end-of-file is reached. Filetypes such
as terminals may lose the end-of-file condition if you do.
An
eof
without an argument uses the last file read as argument.
Empty parentheses () may be used to indicate
the pseudofile formed of the files listed on the command line, i.e.
eof()
is reasonable to use inside a while (<>) loop to detect the end
of only the last file. Use
eof(ARGV)
or eof without the parentheses to
test EACH file in a while (<>) loop. Examples:
<![CDATA[
# reset line numbering on each input file
while (<>) {
print "$.\t$_";
close(ARGV) if (eof); # Not eof().
}
# insert dashes just before last line of last file
while (<>) {
if (eof()) {
print "--------------\n";
close(ARGV); # close or break; is needed if we
# are reading from the terminal
}
print;
}
]]>
Practical hint: you almost never need to use
eof
in Perl, because the
input operators return undef when they run out of data. Testing
eof