Sams Teach Yourself Perl in 21 Days, Second Edition

Using the Debugger: A Simple Example

Probably the best way to see how Perl's debugger works is to show you an example of a typical use of the debugger. For this example, we'll step through the execution of a simple script that contains subroutines—the names script from Day 6, which reads in a list of names, prompts you for something to search for, and returns the names that match that search key.

When you run a script with the Perl debugger turned on, you'll end up inside the debugger itself, which looks something like this:

% perl
						-d  statssubbed.pl statsdata.txt

Loading DB routines from perl5db.pl version 1.01
Emacs support available.

Enter h or `h h' for help.

main::(statssubbed.pl:3):       &initvars();
  DB<1>

Note

Don't worry about starting the ...