> What command displays how may file descriptors a user has open?
>

Since this is crossposted to comp.unix.solaris, I will give a Solaris
answer: /usr/proc/bin/pfiles does it.

E.g.
$ ps -fu dragan | grep bash
  dragan  5555  5547  0 08:32:28 pts/1    0:00 /usr/local/bin/bash

$ /usr/proc/bin/pfiles 5555
5555:   /usr/local/bin/bash
  Current rlimit: 1024 file descriptors
   0: S_IFCHR mode:0620 dev:85,30 ino:54267 uid:517 gid:7 rdev:24,1
      O_RDWR
   1: S_IFCHR mode:0620 dev:85,30 ino:54267 uid:517 gid:7 rdev:24,1
      O_RDWR
   2: S_IFCHR mode:0620 dev:85,30 ino:54267 uid:517 gid:7 rdev:24,1
      O_RDWR
   3: S_IFDOOR mode:0444 dev:199,0 ino:2078 uid:0 gid:0 size:0
      O_RDONLY|O_LARGEFILE FD_CLOEXEC  door to nscd[205]
 255: S_IFCHR mode:0620 dev:85,30 ino:54267 uid:517 gid:7 rdev:24,1
      O_RDWR FD_CLOEXEC

--Dragan Cvetkovic