I know you can just edit the group file, but I want to use system
tools if they are available because I'm running from a program
anyway. The command mostly works (disregard -m) 

useradd -g "900" -G "0,100" -p "*************" -u "1000" -g "1000" -c "George Georgalis" -s "/bin/ksh" "geo"
useradd: Warning: home directory `/home/geo' doesn't exist, and -m was not specified
useradd: can't append group `0' for user `geo'
useradd: can't append group `100' for user `geo'

but what's wrong with -G? This is a 3.1 system, I seem to recall
no issue with 3.0, where I used something similar.

// George



-- 
George Georgalis, systems architect, administrator <IXOYE><