The command most people mean for “cut an entire line” depends on the context:

  • In Vim :
    • Press Esc to be in normal mode, then type dd to cut (delete + yank) the entire current line , including its newline. You can paste it with p.
  • In many GUI text editors/IDEs (VS, many Linux editors, etc.):
    • With nothing selected , Ctrl + X cuts the whole current line ; Ctrl + C copies the whole line.

If you tell me which editor or environment you’re using (Vim, VS Code, Notepad++, terminal, etc.), I can give the exact “cut line” command for that.

“what is the command to cut an entire line?” → Often:

  • Vim: dd
  • Generic editors: Ctrl + X with no selection.

TL;DR:
Most likely answer: Vim →dd; many editors → Ctrl + X on an empty selection.