head

Try it

--lines number default: 10

Keep only the first 10 lines

Usage

$ echo "line 1
line 2
line 3
line 4
line 5
line 6
line 7
line 8
line..." | head

View source

(input, opts = {}) => {
      const n = parseInt(opts.lines) || 10;
      return input.split("\n").slice(0, n).join("\n");
    }