pTools Process Working Directory reporting utility (pwdx)

Based off the Sun Microsystems pwdx utility.  Reports current working
directory of the process given on the command line.

usage:  pwdx pid ...
  (show process working directory)


NOTES:
	Due to strange handeling of pwd link in /proc/pid some processes
		owned by the user running pwdx will not have the pwd file
		readable by the user.  An 'Eterm' process is the first
		notable example.  'Eterm' is not SUID but it SGID, however
		the user who owns the 'Eterm' process cannot read the pwd
		link in /proc becuase it is owned by root.
