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I'm using PuTTY and vim and I'd like to know the current tab size.

How can I check that?

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By inserting a <tab> and counting the number of empty cells. – romainl Dec 17 '12 at 7:42
up vote 4 down vote accepted

You can append ? to a command to get the current value. :set tabstop? will output the current tab size.

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