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List:       perl-beginners
Subject:    Re: Modifing Text Files
From:       "Chas. Owens" <chas.owens () gmail ! com>
Date:       2007-10-29 10:53:44
Message-ID: 58ce48dc0710290353i6cffaf6cr2be90722a38a9e1 () mail ! gmail ! com
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On 10/28/07, Telemachus Odysseos <telemachus07@gmail.com> wrote:
> On 10/25/07, Chas. Owens <chas.owens@gmail.com> wrote:
> > From the sound of it what you want is in-place-editing:
> >
> > #!/usr/bin/perl -i
> >
> > use strict;
> > use warnings;
> >
> > while (<>) {
> >      s/this/that/
> > }
> >
> > The code above will read in any number of files modifying "this" to
> > "that" in each one.
>
> Doesn't that code empty out a file?  That is, isn't there a key line
> missing:
>
> #!/usr/bin/perl -i
> use strict;
> use warnings;
>
> while (<>) {
>      s/this/that/;
>      print;
> }
>
> I apologize if "print;" was so obvious that it didn't even need to be
> mentioned, but to be honest, I tried it without that line and emptied a few
> test files before I got it right.
>

Doh!, that was supposed to be -pi on the command line version and a
print in the full code.

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