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From: Alex Schroeder <alex@emacswiki.org>
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Subject: Re: Searching for lines longer than x characters possible?
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David List <david@davidlist.dk> writes:

> I would like to go through some program source files before converting them 
> to ps, to check for lines longer than, for instance, 80 characters, so that 
> I don't get strange looking ps files.
>
> Is this possible with emacs?

M-x occur RET C-u 81 . RET

Alex.