|Perl Language Reference Manual|
by Larry Wall and others
Paperback (6"x9"), 724 pages
RRP £29.95 ($39.95)
Sales of this book support The Perl Foundation! Get a printed copy>>>
Current line number for the last filehandle accessed.
Each filehandle in Perl counts the number of lines that have been read
from it. (Depending on the value of
$/, Perl's idea of what
constitutes a line may not match yours.) When a line is read from a
filehandle (via readline() or
<>), or when tell() or seek() is
called on it,
$. becomes an alias to the line counter for that
You can adjust the counter by assigning to
$., but this will not
actually move the seek pointer. Localizing
$. will not localize
the filehandle's line count. Instead, it will localize perl's notion
of which filehandle
$. is currently aliased to.
$. is reset when the filehandle is closed, but not when an open
filehandle is reopened without an intervening close(). For more
details, see 7.33. Because
<> never does
an explicit close, line numbers increase across ARGV files (but see
examples in ).
You can also use
HANDLE->input_line_number(EXPR) to access the
line counter for a given filehandle without having to worry about
which handle you last accessed.
(Mnemonic: many programs use "." to mean the current line number.)
|ISBN 9781906966027||Perl Language Reference Manual||See the print edition|