SUPPORTED ATTRIBUTES
====================
  uid         UID of process
  gid         GID of process
  euid        effective UID of process
  egid        effective GID of process
  pid         process ID
  ppid        parent process ID
  pgrp        process group
  sess        session ID
  priority    priority of process
  ttynum      tty number of process
  flags       flags of process
  utime       user mode time
  stime       kernel mode time                  
  time        user + system time                 
  wchan       address of current system call 
  fname       file name
  start       start time (seconds since the epoch)
  state       state of process
  ttydev      path of process's tty