How do I check for \n when using java scanner?

I'm trying to write a scanner so that every time \n is detected, it will scan the line after that until a new \n shows up. I first tried something like this.

import java.util.Scanner;

public class test{
	
	public static void main(String[] args) {
		
		String input = "first line \nsecond line \nthird line";
		
		Scanner sc = new Scanner(input);
		
		while(sc.hasNextLine()) {
			String stuff = sc.nextLine();
			System.out.println(stuff);
		}
		sc.close();
	}
}

Which works, and the output is

first line 
second line 
third line

However, when I try doing the same thing with Scanner(System.in) it doesn't work the same way even with same input

import java.util.Scanner;

public class test{
	
	public static void main(String[] args) {
		System.out.println("Please enter things");
		
		Scanner cmd = new Scanner(System.in); //input: "first \n second \n third"
		
		String input = cmd.nextLine();
		
		Scanner sc = new Scanner(input);
		
		while(sc.hasNextLine()) {
			String stuff = sc.nextLine();
			System.out.println(stuff);
		}
		cmd.close();
		sc.close();
	}
}

Output:

first \n second \n third

What should I change, so that every \n will print a new line?

EDIT:
If the input was

first
second
third

and entered into the prompt at once, would scanner.nextLine() be enough to suffice?

System.out.println("Please enter things");
    Scanner cmd = new Scanner(System.in); //input: "first \n second \n third"
    
    while(cmd.hasNext()) {
    	String word = cmd.next();
    	if(word.equals("\\n")) {
    		System.out.println();
    	}else {
    		System.out.print(word);
    		
    	}
    }

In all honesty, you will need to utilize these sub-strings at some point outside of your while loop so it would actually be better to split the line based on the same delimiter and have each substring as a element within a String Array This way you don't need to utilize Scanner and a while loop for this at all, for example:

String input = "first line \n second line \n third line"; // Read in data file line...
String[] stuffArray = input.split("\\s+?\n\\s+?");
System.out.println(Arrays.toString(stuffArray));
System.out.println();
System.out.println("     OR in other words");
System.out.println();
for(String str : stuffArray) {
    System.out.println(str);
}

If you want to do this using System.in:

Scanner sc = new Scanner(System.in);
System.out.println("Enter text:");
String stuff = sc.nextLine();
String[] subArray = stuff.trim().split("(\\s+)?(\\\\n)(\\s+)?");
System.out.println();
    
// Display substrings...
for (String strg : subArray) {
    System.out.println(strg);
}