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From: Alex Musolino <alex@musolino.id.au>
Date: Fri, 04 Feb 2022 23:09:27 +1030
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Subject: Re: [9front] grep: always show path with '-n'
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> I've always wondered about that behavior for '-n'.  Does anyone know
> the historical reason for omitting the file name when there's only one
> file to search?

Perhaps the original grep only searched one file.