useradd + passwd

[CentOS/RHEL]

useradd -m -d /home/$i $i

echo $i | passwd --stdin $i

#!/bin/bash useradd $1 echo $2 | passwd --stdin $1

It seams the --stdin option does not exist under Ubuntu.

You can write input in prog's stdin like ssh or passwd using socat but I think there is an easier way to do what you want.

CENTOS/RHEL support the --stdin option. Appears Debian and it's variants like Ubuntu do not.

[Ubuntu ]

prometeo -p `mkpasswd someword`

#!/bin/bash useradd $1 -p `mkpasswd $2`

[usage]
# sh leo.sh leo8 leopasswd

출처 : http://nixcraft.com/shell-scripting/15246-ubuntu-linux-set-passwd-stdin-shell-script.html