setting breakpoint before debugging?

[Guest_imported]

I read it was possible to set breakpoints before using the debugger by placing a few lines of code in a script. I know the debugger package is DB and the lines to be debugged are in an array (of hashes?) called something like "dbline".

I tried this:

use DB;
push @{DB:dbline}, {$line_to_stop_at => 1};

but to no avail. Anyone know the correct syntax or the exact data structure in DB?

This would speed up my debugging time immensely. Thanks!