=over

=item input_line_number HANDLE EXPR

=item $INPUT_LINE_NUMBER

=item $NR

=item $.

The current input line number for the last file handle from
which you read (or performed a C<seek> or C<tell> on).  An
explicit close on a filehandle resets the line number.  Because
"C<E<lt>E<gt>>" never does an explicit close, line numbers increase
across ARGV files (but see examples under eof()).  Localizing C<$.> has
the effect of also localizing Perl's notion of "the last read
filehandle".  (Mnemonic: many programs use "." to mean the current line
number.)

=back