> to print all the variable contents when executing line XXX

some hands on examples

a action (per line) and w watchpoint (each time) take Perl code to be evaluated.

you can do pretty nifty things with that already

sample code

use strict;
use warnings;
$|=1;            # disable buffering

my $a;
our $y;


for (0..10) {
   print;
   $a++;
   $y++;
}

[download]

a = action cmd on line
DB<71> h a
a [line] command
        Set an action to be done before the line is executed;
        line defaults to the current execution line.
        Sequence is: check for breakpoint/watchpoint, print line
        if necessary, do action, prompt user if necessary,
        execute line.
a        Does nothing

[download]

a doesn't break unless you set $DB::single explicitly to 1

<Reveal this spoiler or all spoilers in this node or all in this thread>
w = watch-expression

  DB<79> h w
w expr        Add a global watch-expression.
w             Does nothing

[download]

w stops if the returned value has changed

w $a would stop each time $a is changing

this only stops if $a is inside the intervall

<Reveal this spoiler>

this only stops for the first print and the first non print (print returns 1)

<Reveal this spoiler>

Cheers Rolf
(addicted to the Perl Programming Language and ☆☆☆☆ :)
Je suis Charlie!

In reply to Re: How can I print variable contents from the debugger non-interactively? ( a = line action ; w = watch changes everywhere) by LanX
in thread How can I print variable contents from the debugger non-interactively? by davehorner

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