I Want My Character To move On Specific Line With Script

You have a couple of options based on how accurate you want to be, but both will rely on using some form of loop to go through them:

1. Have a list/array of transform points,

2. Using a for loop, foreach point, until you reach the Count/Length of the block -

3. Move your player transform to the next point, and when (player.transform.position - array[loop].position).magnitude is less than a range you choose, increment the for loop

4. Continue until you have reached the end.

In code this translates to:

 float nextPointRange = 5.0f;
 Transform[] curveWaypointsArray;
 Transform playerTransform;
 
 // An IEnumerator makes this easier to start when needed,
 // And also allows a greater degree of control over the movement
 IEnumerator MoveThroughArray()
 {
      int loop = 0;
      while(loop < curveWaypointsArray.Length)
      {
           //for simplicity just make the player face the next point each frame
           playerTransform.LookAt(curveWaypointsArray[loop].position);
 
            //while the player is not close to the next position, move forward
            while((curveWaypointsArray[loop].position - playerTransform.position).magnitude > nextPointRange)
           {
                playerTransform.Translate(playerTransform.forward);
                yield return new WaitForEndOfFrame();
           }
           //this makes each run of the while loop last a frame
           yield return new WaitForEndOfFrame();
      }
 
 }
 

Now you can implement this in an update, but it will be a bit more scrappy than an IEnumerator like the one above, which will make doing this far easier to implement, so take an hour/two to read up on them. Hope this helps.