Breakpoints b <line-number or subroutine> <condition> - Set a breakpoint causes the debugger to return to the user from continuous execution (c) DB<1> b buggySub ($x > 23) DB<2> b 500 related commands: d <line-number> - delete the breakpoint at the specified line, or at the current line D - delete all breakpoints L - list all breakpoints and actions (see example)