sorting of "cvs update" results

[_]

What controls how the results of the "cvs up" command are sorted? On
some Linux machines and in Cygwin I get all the unknown files (question
mark in status) then followed by all the P/U/M/C's sorted by file path,
e.g.:

% cvs up
? v1
? db/01.txt
? db/rpt/x.sql
P b.xml
U OBE/S/r.sh
U c/test.xsd
M ext/help/src/xml/help.xml
P w/css/common.css

On other Linux machines I have the output be sorted by filepath, so the
above will be:

% cvs up
U OBE/S/r.sh
P b.xml
U c/test.xsd
? db/01.txt
? db/rpt/x.sql
M ext/help/src/xml/help.xml
? v1
P w/css/common.css

I like the first output much better, but can't figure out what controls
it.

I have CVS 1.11.19 on all Linux machines, and all of it is under zsh.

TIA, 

George