Perl - Debugging

Finally, I have to debug a perl script. These are some of the helpful command. I am assuming the perl debugger version 1.27


  • 1. Debugging - Adding -d will trigger a debug mode on your perl script


perl -d myscript.pl

  •  Stepping - Type s in debug console will let you step through your code line by line



  • Break Point - Type b (line number) in debug console will let you set a break point


b 100


  • Print variable - Type p (variable) in debug console will display your variable value


p $varname


  • Continue - Type c in debug console will bring you to the next break point



  • Delete a Break Point - Type B (line number) in debug console to remove a break point


B 100


  • List all break point/action - Type L in debug console to list all breakpoint and action



  • Watch - Type w (variable) in debug console to set a watch to the variable. Changes will appear on the debug console if your watch variable is altered


w $varname


  • Delete a Watch - Type W (variable) in debug console to delete a watch point
W $varname
  • Help - Type h in debug console to get help list



  • Reload - Type R in debug console to reload the program in debug mode



  • Quit - Type q in debug console to quit debugging


See the attached image for example


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