Hi pg,

gathering from your nick name, if not you who else should be familiar with the inards of pagers ;-)

n.b. @ perlmonks' moderators, sorry for using the <pre> tag once again. When I logged in I just noticed for a second your request on my first posting here to refrain from using this tag. I'm afraid, I still will have to read your FAQs on formatting guidelines. I have been too impatient to reply to my post's responders, and didn't know for now how else to avoid the clutter.

Now back to pg.
Of course I felt that setting $ENV{PAGER} within the debug session was at a too late stage. That's why I already tried the shell's (i.e. HP-UX's standard shell which is a POSIX Bourne type) way of giving processes an environment by invocating the Perl debugger like this:

$ PAGER=/usr/local/bin/less /usr/bin/perl -de ./my_buggy_script.pl
[download]

(of course one could have also used the Unix "env" command)

and I also tried the even better way (like you mentioned) of explicitly exporting PAGER:

$ export PAGER=/usr/local/bin/less
$ printenv PAGER                  
/usr/local/bin/less
$ perl -de my_buggy_script.pl
[download]

Then in the debugger I did this:

      'time' => 1039509243
   '/var/spool/sw' => HASH(0x4033aca0)
      'basetype' => 'vxfs'
      'bavail' => 262045
      'bfree' => 279512
      'blocks' => 512000
      'bsize' => 8192
      'favail' => 69876
      'ffree' => 69876
      'files' => 73740
      'flag' => 0
      'frsize' => 1024
      'fsid' => 1073741834
      'fstr' => '/var/spool/sw'
      'namemax' => 255
      'size' => 512000
      'time' => 1037307204
  DB<4> H
3: x \%mnt
2: |x \%mnt
1: o pager?
  DB<4> !1
o pager?
               pager = '|/usr/local/bin/less'
  DB<5>
[download]

n.b. the hash %mnt is a lol with mount points as keys and as values the results of statvfs syscalls on these as a hashref (retrieved through the wonderful Filesys::Statvfs CPAN module).

By the debugger history above I just wanted to show that "|x \%mnt" fails (i.e. displays nothing), whereas "x \%mnt" scrolls over the screen (I only copied the last key's value here).

This only happens with my Perl builds of "new" releases > 5.6.0 On the boxes where I still have Perl <= 5.6.0 the debugger works as expected, and honours preset PAGER settings.

Looks to me as if there is a bug in the Perl port for HP-UX 11.X 64Bit.

Btw, have you tried to build a Perl 5.8.X on HP-UX (in case you have access to this platform)? Maybe the Configure routine is broken for this platform. I can tell you how long I struggled to get DBD::Oracle working on this platform. Maybe I miss some library, patch, or the linking was insufficient after Configure and make (e.g. PIC etc.)

Would be nice to here from someone who uses the Perl debugger on HP-UX if they encounter similar strangenesses.

Anyway, many thanks for pointing me to the involved Perl code.

Edit by tye (replace PRE with formatting)

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