Debugger watchpoints in UNIX ?

[George Bogatko]

At least System5.2 and beyond do watchpoints.
>From the manual:

	  variable$m count
	  address:m count
	       Single step (as with s) until the specified location is
	       modified	with a new value.  If count is omitted,	it is
	       effectively infinity.  Variable must be accessible from
	       the current procedure.  Since this command is done by
	       software, it can	be very	slow.

GB