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I have written this in aura as

                             var newline ='';
                             newline +='\n';
                            component.set("v.input",newline);

but it is not working.

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    This is not enough detail to identify the problem. Please edit your post to provide a reproducible example and specific description of what is not working.
    – David Reed
    Jan 10 at 16:11
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The most literal interpretation in Aura would be:

const myInput = component.find("myInput");
let value = myInput.get("v.value");
value += "\n";
myInput.set("v.value", value);

Where myInput is defined on the component as its aura:id:

<lightning-textarea aura:id="myInput" ...

Feel free to change this as you desire.

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