Lab1: The Perl Debugger

Assuming you have a Perl program in a file named prog.pl in the current directory, type

perl -p prog.pl

to start the Perl debugger. Try the following commands:

• h - give a brief list of debugger commands (man perldebug will give more extensive help)
• v - view source code near current line
• v x - view source code near line x
• l x - print line x
• l x,y - print lines x through y
• l subname - print the definition of subroutine subname
• p $x - print the value of variable x
• s - execute the next line of code, step into subroutines
• n - execute the next line of code, subroutine calls count as one line
• carriage return - s or n, whichever was most recent
• b x - set a breakpoint at line x
• b subname - set a breakpoint at subroutine subname
• c - continue execution
• L - list all breakpoints
• B x - delete breakpoint at line x
• B * - delete all brakpoints
• q - quit back to the shell