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I want to move a line by 4 bytes using vi editor. What command should I use?

I tried ">>" and it does move but it moves by 8 bytes..

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Why are you making measurements in "bytes" in a text editor? Text is by the "character" or "glyph". – Ben Voigt May 5 '14 at 6:44
Why are you manually inserting space. Are you trying to format code. If so there are probably better ways. If you could explain what you are trying to achieve at a higher level that may be more useful. – Loki Astari May 5 '14 at 7:25

Default shiftwidth in vi is 8 spaces, from :help shiftwidth:

'shiftwidth' 'sw'       number  (default 8)
                        local to buffer
        Number of spaces to use for each step of (auto)indent.  Used for
        'cindent', >>, <<, etc.

So you should set shiftwidth to 4:

set shiftwidth=4

Add above line to .exrc file to make it persistence.

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In normal mode, type 4I then press space and then escape.

This will insert 4 spaces at the beginning of the line and move the line to the right. I assume this is what you want, since you mentioned that >> almost works for you.

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When you are in the middle of the line, this solution works with a slight modification: use 4I (capital-i) for inserting the spaces at the beginning of the line. – Walter A May 4 '14 at 21:04
Thanks Walter A, updated my answer. – Alexander May 4 '14 at 21:05

When you are familiar with sed, you can also try sed-like commands. Suppose you just added an if statement and want to indent the lines until the next }. Then try

:.,/}/-1 s/^/    /
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