user_audit.sh funcion

#!/bin/bash

# Crear lista de usuarios del sistema


arr_users=( $(cat /etc/passwd | cut -d ":" -f 1) )



valid_shells () {

        local user
        local shell

        user=$1 # variable local
        shell=$(getent passwd $user | cut -d ":" -f 7)

        # cuando la variable esta vacia se rellena con
        # valor predeterminado
        #shell=${shell:-noshell}

        echo $shell

        grep "$shell" /etc/shells > /dev/null 2>&1 && return 0
        return 1


}





for user in ${arr_users[@]};do

	echo ${user}:
 	id $user


	uuid=$(getent passwd $user | cut -d ":" -f 3)



#		true             and                 true   = true
#		false		and 		true = false
#		true		and		false = false
#		true		or		false = true
#		false		or		true = true
#		false		or		false = false
#
	if [ $uuid -lt 1000 ] && valid_shells $user ;then

		echo -e "\033[1;31mWARNING\033[0m: special user has shell"
	fi

	echo shell: $(getent passwd $user | cut -d ":" -f 7)


	echo "---"

done