[lug] Perl question: how to print embedded metacharacters

[Jeffrey Haemer]

Chip,

Yep, I'm using the shell to do the dirty work.

I don't doubt there are elegant, pure-Perl solutions.  I was only trying to
find something that would work for you, immediately, until someone else
volunteers a more PC (Perlishly Correct) way. :-)

On Wed, Nov 25, 2009 at 9:34 AM, Chip Atkinson <chip at pupman.com> wrote:

> Hmmmm... that does work, but isn't it using the bash printf rather than
> perl?  My concern is how fast it would be.  I can experiment there though,
> and it does work.
>
> Thanks for your help!
>
> Chip
>
> On Wed, 25 Nov 2009, Jeffrey Haemer wrote:
>
> > Chip,
> >
> > Okay.  Would something like this be good enough?
> >
> >
> > #!/usr/bin/perl
> >
> > while (<>) {
> >   $_=` printf "$_" `;
> >   print;
> > }
> >
> >
> >
> >
> > On Wed, Nov 25, 2009 at 9:06 AM, Chip Atkinson <chip at pupman.com> wrote:
> >
> > > No, unfortunately.
> > >
> > > The problem is that the script reads the string in from the command
> file,
> > > so I need to interpret the string before printing it.  Here's another
> > > example:
> > > ---------------------
> > > chip at chip-desktop:~$ cat try2.pl
> > > #!/usr/bin/perl
> > >
> > > #my $kw = 'abc\ndef';
> > > #my $nv = "${\($kw)}";
> > >
> > > while (<>) {
> > >  print "$_";
> > > }
> > > chip at chip-desktop:~$ echo 'abc\ndef' | ./try2.pl
> > > abc\ndef
> > > chip at chip-desktop:~$
> > > ---------------------------------
> > > In a sense, I need the opposite of quotemeta -- something that takes in
> a
> > > string and does the metacharacter replacements.
> > >
> > > I know that something like
> > > while (<>) {
> > >  s/\\n/\n/g;
> > >  # etc. for all metacharacter sequences...
> > >  print;
> > > }
> > >
> > > would work but I wanted to avoid the "etc. for all metacharacter
> > > sequences"
> > >
> > > Hopefully that's more understandable.
> > >
> > > Chip
> > >
> > > On Wed, 25 Nov 2009, Jeffrey Haemer wrote:
> > >
> > > > Chip,
> > > >
> > > > Can you do this instead?
> > > >
> > > > my $kw = "abc\ndef";
> > > >
> > > > If not, can you explain in enough detail that I can try again? :-)
> > > >
> > > > On Wed, Nov 25, 2009 at 8:29 AM, Chip Atkinson <chip at pupman.com>
> wrote:
> > > >
> > > > > Greetings,
> > > > >
> > > > > I'm working on a perl script that reads strings from a
> configuration
> > > file
> > > > > and prints them out.  What I'd like to be able to do is have any
> > > embedded
> > > > > metacharacters interpreted but I'd like to avoid doing the
> > > substitutions
> > > > > myself.
> > > > >
> > > > > For example, here is a little script to emulate the problem:
> > > > >
> > > > > #!/usr/bin/perl
> > > > >
> > > > > my $kw = 'abc\ndef';
> > > > >
> > > > > print "$kw";
> > > > > ----------------------
> > > > > the output is
> > > > > abc\ndef
> > > > >
> > > > > What I want is
> > > > > abc
> > > > > def
> > > > >
> > > > > --------------
> > > > > I tried to jfgi but no joy.
> > > > >
> > > > > Thanks in advance.
> > > > >
> > > > > Chip
> > > > >
> > > > > _______________________________________________
> > > > > Web Page:  http://lug.boulder.co.us
> > > > > Mailing List: http://lists.lug.boulder.co.us/mailman/listinfo/lug
> > > > > Join us on IRC: lug.boulder.co.us port=6667
> channel=#hackingsociety
> > > > >
> > > >
> > > >
> > > >
> > > > --
> > > > Click to Call Me Now! --
> > > > http://seejeffrun.blogspot.com/2009/09/call-me-now.html
> > > >
> > > > Jeffrey Haemer <jeffrey.haemer at gmail.com>
> > > > 720-837-8908 [cell],  @goyishekop [twitter]
> > > > http://www.youtube.com/user/goyishekop [vlog]
> > > >
> > >
> > > _______________________________________________
> > > Web Page:  http://lug.boulder.co.us
> > > Mailing List: http://lists.lug.boulder.co.us/mailman/listinfo/lug
> > > Join us on IRC: lug.boulder.co.us port=6667 channel=#hackingsociety
> > >
> >
> >
> >
> > --
> > Click to Call Me Now! --
> > http://seejeffrun.blogspot.com/2009/09/call-me-now.html
> >
> > Jeffrey Haemer <jeffrey.haemer at gmail.com>
> > 720-837-8908 [cell],  @goyishekop [twitter]
> > http://www.youtube.com/user/goyishekop [vlog]
> >
>
> _______________________________________________
> Web Page:  http://lug.boulder.co.us
> Mailing List: http://lists.lug.boulder.co.us/mailman/listinfo/lug
> Join us on IRC: lug.boulder.co.us port=6667 channel=#hackingsociety
>



-- 
Click to Call Me Now! --
http://seejeffrun.blogspot.com/2009/09/call-me-now.html

Jeffrey Haemer <jeffrey.haemer at gmail.com>
720-837-8908 [cell],  @goyishekop [twitter]
http://www.youtube.com/user/goyishekop [vlog]
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.lug.boulder.co.us/pipermail/lug/attachments/20091125/d68d6e64/attachment.html>