Which THREE of the following vi command-mode commands remove text from the buffer? (Choose three.)
LPIC-1 Exam 101-500, objective 103. GNU and Unix commands medium
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How these questions are written — where each question comes from, what the verification ledger records, and what happens when one is found wrong.
The options
Choose 3.
Correct dd
Correct. It deletes the current line and places it in the unnamed buffer.
Correct x
Correct. It deletes the single character under the cursor.
Correct D
Correct. It deletes from the cursor to the end of the line, the shorthand for `d$`.
Not correct yy
Wrong. `yy` yanks, that is copies, the current line into the buffer and leaves the file unchanged.
Not correct p
Wrong, and the inverse. `p` puts the buffer's contents into the file after the cursor, adding text rather than removing it.
Not correct :w
Wrong. `:w` writes the buffer to disk; it is an ex command about saving, not about editing content.
Why
The delete family in vi all cut rather than erase: the removed text lands in the unnamed buffer and can be re-inserted with `p` or `P`. `x` takes a character, `dd` a line, `D` the remainder of a line, and `d` plus any motion takes whatever that motion covers. Yank commands fill the same buffer without touching the file, which is why `dd`+`p` moves a line and `yy`+`p` copies one.
Where this comes from
- Cited
- manual page vi(1p)
Practise this
Reading one question is not practice. The trainer will draw a short set from objective 103 and space the ones you get wrong.
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