user-add.sh

#!/bin/bash
if [ $(id -u) -eq 0 ]; then
    read -p "User name: " username
    read -p "Password: " password
    read -p "Days to expired: " dias
    final=$(date "+%Y-%m-%d" -d "+$dias days")
    gui=$(date "+%d/%m/%Y" -d "+$dias days")
    egrep "^$username" /etc/passwd >/dev/null
    if [ $? -eq 0 ]; then
        echo "Username $username already exists!"
        exit 1
    else
        pass=$(perl -e 'print crypt($ARGV[0], "password")' $password)
        useradd -e $final -M -s /bin/false -p $pass $username
        [ $? -eq 0 ] && echo "Active until $gui!" || echo "Could not create the User!"
        fi
    else
    echo "Only root may add a user to the system"
    exit 2
fi