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X-Hacker.org- PERL 4.0 Reference Guide - Norton Guide
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$. The current input line number of the last filehandle
that was read. Readonly. Remember that only an
explicit close on the filehandle resets the line
number. Since <> never does an explicit close, line
numbers increase across ARGV files (but see examples
under eof). (Mnemonic: many programs use . to mean
the current line number.)
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