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I know that with gvim, I can use the following command to set the width of a window:

set columns=80

How can I do the same, but instead of setting the width, increasing it by a certain value?

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up vote 1 down vote accepted
:set columns+=10

See :help :set+=.

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Perfect, thanks! – Wuffers Jul 31 '11 at 16:35

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