#!/bin/bash
FILE=$1
PASS="a"
while read line; do
    set $line
    TEMP=$2
    pass=$(date +%s | sha256sum | base64 | head -c 32 ; echo)
    user=${line:0:1}${line:1:1}${TEMP:0:1}${TEMP:1:1}
    usernamesize=${#user}
    [ $usernamesize -eq 0 ] && break
    #number is how many users that matches the string 'user'.
    number=$(cut -d: -f1 /etc/passwd | grep ^"$user"[0-9] | wc -l)
    user=$user$number
    useradd -m $user
    if [ "$?" -eq 0 ]; then
     echo $user:$pass | chpasswd
     echo $user - $pass
    else
     echo "Error."
    fi
done < "$FILE"