procage: when was a Linux process started

While ps will give you a summarized version of when a process started, it shows less and less precision the older the process is. It's sometimes useful to know precisely when this happened, especially for old processes; hence, procage.py.

Usage: procage.py [-a] PID [PID ...]

If given a -a argument, procage.py reports the process's age in seconds instead of its start time.

This is Linux specific, since it uses Linux's /proc information.