#!/bin/bash
usernamex="$1"
#read -p "Please to create a username " usernamex -- if you manuel entry for username
echo "user $1 for password ... "
read -sre passwordx
echo "password setting up ... "
echo ""
sleep 2

function salt ()
{
        characterset="0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz./"
        saltkeylength=8 #it is random character length give what you want to which length
        local i
        i=0
                while [ $i -ne "$saltkeylength" ]
                do
                let indis=$RANDOM%${#characterset}
                saltkey+="${characterset:$indis:1}"                
                let i+=1
                done
}
salt ""

echo "md5 hashing password is get...ok!"
sleep 2

userpasswordx=`openssl passwd -1 -salt $saltkey $passwordx`
#openssl passwd -1 $passwordx -- if you encrypt password without saltkey
useradd -p $userpasswordx $usernamex

# and can add your error control code
if [ $? -eq 0 ]
        then
        echo "User $usernamex successfully added...ok!"
                else
                echo "Problem adding $usernamex"
                fi

root@rhnserver include]# ./useraddx.sh testuser
user testuser for password ...
password setting up ...

md5 hashing password is get...ok!
User testuser successfully added...ok!

[root@rhnserver include]# cat /etc/shadow | grep testuser
testuser:$1$Kl$SLUJfKKAMALM5fDPFXweR0:14695:0:99999:7:::

 
realm=yourdomain.com

 
passwd:     files winbind
shadow:     files winbind
group:      files winbind
hosts:      files dns winbind
bootparams: files
ethers:     files
protocols:  files winbind
services:   files winbind
netgroup:   files winbind
publickey:  files
automount:  files winbind