Example:
#create "abc" group and group id is 100.
groupadd -g 100 abc
#create "tempuser" with user id 10000(-u), group id 100(-g), home directory /export/home/tempuser(-d), create directory if not exist(-m), shell(-s), comment(-c).
useradd -u 10000 -g 100 -d /export/home/tempuser -m -s /bin/ksh -c "Temp User" tempuser
tikual