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converts tabs to spaces, or spaces to tabs

You can set the 'expandtab' (abbreviated to 'et') option so each tab that you type is converted to an equivalent number of spaces. And you can use the :retab command to convert all existing tabs to spaces. You can do both in one command: 
:set et|retab
You can also convert spaces to tabs: 
:set noet|retab!
Both of the above examples should be used with caution. They convert all sequences, even those that might be in a "quoted string like this".
This tip shows how to convert only the indents at the left margin. Any spaces or tabs after the first non-white character are not affected.
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