I don't understand the connection between breakpoints in the debugger and command-line options. (?)

I assume you might be interested to know that

• The debugger is reading a config file, you can define breakpoints there
• You can also define debugger commands like b 100 in the command line at start-up of the debugger to set a breakpoint at line 100
• You can define your own "alias" command which interactively reads and sets breakpoints.

see also perldb , perldbguts and DB ...

... and of course the h cmd:

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