Tutorial by Examples

To run script in debug mode you should add -d option in the command line: $perl -d script.pl If t is specified, it indicates to the debugger that threads will be used in the code being debugged: $perl -dt script.pl Additional info at perldocperlrun

$perl -d:MOD script.pl runs the program under the control of a debugging, profiling, or tracing module installed as Devel::MOD. For example, -d:NYTProf executes the program using the Devel::NYTProf profiler. See all available Devel modules here Recommended modules: Devel::NYTProf -- Powerful ...