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condition bp-number Perl-expression
bp-number is a breakpoint number.
Perl-expresion is a Perl expression which must evaluate to true before the breakpoint is honored.
If perl-expression is absent,
any existing condition is removed; i.e.,
the breakpoint is made unconditional.
condition 5 x > 10 # Breakpoint 5 now has condition x > 10
condition 5 # Remove above condition
break, enable and disable.