enable script on trigger

hey, I want to figure out how I can enable the player’s shooting script when he walks into a trigger. here is the shooting script that I want to be enabled:

var bullet : Rigidbody; //the bullet we are shooting must have a rigidbody
var Speed = 32000; //the speed the bullet is shot at

private var shooting = false; //this is only used if rapid fire is set to true
//RateOfFire private
var Counter = Time.deltaTime;
var RateOfFire = 0.5;

function FixedUpdate (){

if(Input.GetButtonDown("Fire1")){
    shooting=true;
}
 
if(Input.GetButtonUp("Fire1")){
    shooting=false;
}
 
if(shooting==true){ 
    Counter += Time.deltaTime;
 
    if(RateOfFire < Counter){
        var shotRapid =Instantiate(bullet, transform.position, Quaternion.identity);
        shotRapid.GetComponent.<Rigidbody>().AddForce(transform.forward * Speed);
        Counter=0;
    } 
 
} 

}

***this is not my script and i have no knowledge in coding. sorry lol.

@RobAnthem sorry, I get a compiler error for the first script:

Unexpected symbol ‘MonoBehaviour’, expecting ‘class’, ‘delegate’, ‘enum’, ‘interface’, ‘partial’, or ‘struct’