You are reordering entries in a configuration file with vi. In command mode you put the cursor on the line you want to move and press `dd`, then move the cursor down two lines. Which single keystroke re-inserts the removed line below the cursor?
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
Correct p
Correct. `dd` cuts the line into the unnamed buffer, and lowercase `p` puts the buffer's contents after the cursor. For a whole-line buffer, 'after' means on the line below.
Not correct P
Wrong for this task. Uppercase `P` also pastes, but before the cursor, so the line would land above the current line rather than below it.
Not correct u
Wrong. `u` undoes the last change, which would restore the line to its original position and abandon the move.
Not correct yy
Wrong. `yy` yanks (copies) the current line into the buffer, overwriting the line you just cut, and inserts nothing.
Why
vi's delete commands are cut operations: the removed text goes into the unnamed buffer, so `dd` followed by `p` is the standard way to move a line. Case decides the side the buffer lands on — `p` puts after the cursor, `P` puts before it — and the same pair works for yanked text after `yy`. Because the buffer holds whole lines here, 'after' and 'before' are read as the next and previous line rather than the next and previous character.
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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