report process status

-a     Write information for all processes associated with terminals. Implementations  may  omit  session
       leaders from this list.

-u  userlist
       Write  information  for  processes whose user ID numbers or login names are given in userlist. The
       application shall ensure that the userlist is a single argument in the form of a <blank> or comma-
       separated  list.  In  the  listing, the numerical user ID shall be written unless the -f option is
       used, in which case the login name shall be written.