vi filename:w or :wq:q!/text, press Enter to jump to the first matching text, use n and N to jump to the next or previous match:s/old/new/g, where old is the text to be replaced, new is the new text, g means global replacementyy to copy the current line, enter y+n+y to copy n lines, then move the cursor to the location to be pasted, enter p to pasteu:q, if there are modifications, it will prompt to save, otherwise it will quit directly