Enable Breakpoint after Event Occurs

Enable a breakpoint only after another event has fired. Suppose things go bad in function hash, but only after the 1300'th symbol lookup:

(dbx) when in lookup -count 1300 {
	stop in hash
	hash_bpt=$newhandlerid
	when proc_gone -temp { delete $hash_bpt; }
}

$newhandlerid is referring to the just executed stop in command.