In vi's command mode you want to copy the current line into the unnamed buffer without removing it from the file. Type the two-keystroke command that does it.
LPIC-1 Exam 101-500, objective 103. GNU and Unix commands easy
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Answer
Type the answer.
Accepted answer
yy
Case sensitive — Linux is, and grading LS as ls would teach a falsehood.
Why
`y` is the yank operator and, like the other operators, doubling it applies it to the whole current line, so `yy` copies the line. Nothing appears to happen because the file is unchanged; the copy sits in the unnamed buffer until `p` or `P` puts it back. The delete equivalent is `dd`, which fills the same buffer but also removes the line.
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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