RE: $_
From: Dan Muey (dmuey_at_infiniplex.com)
Date: 12/30/03
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Date: Tue, 30 Dec 2003 10:49:44 -0600 To: <beginners@perl.org>
> The lines will always be defined but I need to process that
> previous line. I am still kinda in the closet on what you mean.
>
He means the variable $last he used. I've tried to do an exqample that may help clear it up for you:
my $prev;
for(qw(a b c d e f g)) {
print "Previous item was $prev\n" if defined $prev;
print "Current item is $_\n";
$prev = $_;
}
HTH
DMuey
> ..
> On Tue, 2003-12-30 at 09:42, James Edward Gray II wrote:
> On Dec 30, 2003, at 10:36 AM, Eric Walker wrote:
>
> > I am going through a file and when I enter a certain
> routine, I am
> > entering a while loop with the <IN> construct. Is
> there a way to back
> > the counter up or back up one line before I go into the
> while loop?
> >
> > a
> > b
> > c
> > d
> >
> > Instead of seeing b when I enter the while loop, adjust
> some option and
> > see the a.
>
> How about adding:
>
> my $last;
> while (<IN>) {
> # use $last here, but watch for undef on the first
> iteration, for
> example:
> do_something( $last ) if defined $last;
>
> $last = $_;
> }
>
> Hope that helps.
>
> James
>
>
>
>
>
> --
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