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From: Mary Ann Horton <mah@mhorton.net>
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Subject: Re: [TUHS] Were cron and at done at the same time? Or one before
 the other?
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My V6 manual has cron(VIII) - documentation of /usr/lib/crontab - but no 
mention of at.

This is consistent with my recollection - I first saw at in V7.

     Mary Ann

On 12/8/20 10:11 AM, ron minnich wrote:
> When I got into Unix in 1976 cron and at were both there.
>
> I got to wondering for no particular reason which came first -- I had
> always assumed cron, but ...?
>
> Anyone know?