Process Tracing
Processes are, in general, units of isolation within a Unix system. This perhaps is the most important abstraction the kernel provides, because it implies that malicious or badly written programs can never affect proper ones. Isolation is the foundation of safety, but sometimes you want to turn it off.
Think of the interactive GNU Debugger (GDB) (Figure 1). You'd certainly want it to stop your code execution at specified points or execute it step-by-step, and it is hardly useful if it can't add watches or otherwise peek into the program being debugged; however, the debugger and the program it debugs are two different, isolated processes, so how could it ever happen?
Figure 1: GDB comes with an interactive text-mode user interface, too. To enter or leave, type C-x C-a (TUI key bindings [1]).
[...]
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