You're prossibly interested in watch expressions set with something along the lines of w $var which will show the old and new value whenever the watched expression changes values (and that can be an expression, not just a single variable; whenever the value of that expression is different the watch triggers). There's not much extra detail in the docs but if you search perldebug you can find this and play with a short test script:
w expr Add a global watch-expression. Whenever a watched glob
+al
changes the debugger will stop and display the old and
+ new
values.
Alternately you might be interested in a conditional breakpoint which will only drop into the debugger if a supplied expression evaluates to true (unlike the typical unconditional breakpoint you get with the normal b LINE that always stops at line number LINE).
The cake is a lie.
The cake is a lie.
The cake is a lie.
-
Are you posting in the right place? Check out Where do I post X? to know for sure.
-
Posts may use any of the Perl Monks Approved HTML tags. Currently these include the following:
<code> <a> <b> <big>
<blockquote> <br /> <dd>
<dl> <dt> <em> <font>
<h1> <h2> <h3> <h4>
<h5> <h6> <hr /> <i>
<li> <nbsp> <ol> <p>
<small> <strike> <strong>
<sub> <sup> <table>
<td> <th> <tr> <tt>
<u> <ul>
-
Snippets of code should be wrapped in
<code> tags not
<pre> tags. In fact, <pre>
tags should generally be avoided. If they must
be used, extreme care should be
taken to ensure that their contents do not
have long lines (<70 chars), in order to prevent
horizontal scrolling (and possible janitor
intervention).
-
Want more info? How to link
or How to display code and escape characters
are good places to start.
|