#!/bin/bash
usuarios="/etc/passwd"
id=$(id -u)
if [ "$id" != "0" ]
then
	echo "Este script necesita privilegios de administracion"
	exit 1
fi
if [ $# -ne 2 ]
then
	echo "Numero incorrecto de parametros"
elif [ $1 = "-a" ]
then
    while read -r line
    do
       	user=$(echo "$line" | cut -d "," -f 1)
        pass=$(echo "$line" | cut -d "," -f 2)
        name=$(echo "$line" | cut -d "," -f 3)
        if [ -n "$user" -a -n "$pass" -a -n "$name" ]
        then
            actual=$(grep "^$user:" "$usuarios")
            if [ -n "$actual" ]
            then
                echo "El usuario "$user" ya existe"
            else
                useradd -U -m -K UID_MIN=1000 -k "/etc/skel" -c "$name" "$user"
		echo ""$user":"$pass"" | chpasswd -c MD5
                chage -M 30 "$user"
                echo ""$name" ha sido creado."
            fi
        else
            echo "Campo invalido"
            exit 1
        fi
    done < "$2"
elif [ $1 = "-s" ]
then
    while read -r line
    do
        user=$(echo "$line" | cut -d "," -f 1)
        if [ -n "$user" ]
        then
            actual=$(grep "^$user:" "$usuarios")
			user_home=$(grep "^$user:" "$usuarios" | cut -d":" -f6)
            if [ -n "$actual" ]
            then
                if [ ! -d "/extra" ]
                then
                    mkdir /extra
					mkdir /extra/backup
                elif [ ! -d "/extra/backup" ]
                then
                	mkdir /extra/backup
                fi
                if $(tar -cf - "$user_home"/* > /home/as/Escritorio/"$user".tar)
                then
                	userdel -r "$user" > /dev/null 2>&1
                	echo ""$user" ha sido borrado."
		else
			echo ""$user" no ha podido ser borrado."
                fi
            fi
        else
            echo "Campo invalido"
            exit 1
        fi
    done < "$2"
else
    echo "Opcion invalida" >&2
    exit 1
fi