well like i said, if you just type "useradd" in the terminal you would see all the options that that command can take ... so this is your output :
Code:
root@slackbox:~# useradd
usage: useradd [-u uid [-o]] [-g group] [-G group,...]
[-d home] [-s shell] [-c comment] [-m [-k template]]
[-f inactive] [-e expire ] [-p passwd] name
useradd -D [-g group] [-b base] [-s shell]
[-f inactive] [-e expire ]
and as you can see the -p switch is what your looking for .. and if you wanna make adding users a little easier, you can use the adduser command ...
but with the useradd command you can type something along the lines of :
useradd -u 505 -g users -d /home/newuser -s /bin/bash -p newuserpassword NewUser