This is what happens when trying to finger -l a user on a host running
efingerd:

locust:~$ finger -l frodo@ant.morgul.net
[ant.morgul.net]

Hello noahm@locust.lcs.mit.edu,
/etc/efingerd/nouser: [: too many arguments
/etc/efingerd/nouser: [: too many arguments
/etc/efingerd/nouser: [: too many arguments
/etc/efingerd/nouser: [: too many arguments
/etc/efingerd/nouser: [: too many arguments
You tried to finger non existant user!!!
Your attempt is logged and sent to C.I.A., K.G.B. and S.I.S.
Expect a visit soon.


In this case, the machine "ant.morgul.net" is running the default
installation of efingerd.  I just installed it, have done no tweaking,
and frodo@ant.morgul.net does not have a .efingerd file.

noah

this particular bug was fixed in 1.6, you might want to upgrade

however, the default configuration does not support -l
option (and just displays no such user), so you probably
want to write your own :-)