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I'm using vim to browse through some log files (the file extension is .log) which contain a lot of XML.

How can I turn on XML syntax highlighting after opening the file? Of course, I don't actually want to associate XML syntax highlighting with all log files.

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up vote 7 down vote accepted

The command you want is ":setfiletype". For example:

:setf xml

See ":help :setfiletype".

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Beautiful, this is exactly what I was looking for. Thanks! – Mansoor Siddiqui Jan 27 '12 at 22:42

You can place this in your ~/.vimrc file as well

au BufNewFile, BufRead *.extension_name set filetype=xml

Replace extension_name with the extension you want, reopen vim, and you will see xml syntax highlight.

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This didn't work for me, this answer did work: autocmd BufEnter *.extension_name :setlocal filetype=xml – agold Dec 22 '15 at 16:18
    
It should be noted that this will cause all .extension_name files to be treated as the given filetype, which is behavior specifically mentioned as not wanted in the question. Still, potentially useful to others, so no downvote from me. – 8bittree Apr 27 at 16:28

Expanding on @RubyFanatic answer, what worked for me was (in vim's command mode):

au BufNewFile,BufRead *.extension_name setf xml
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