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Re: SECONDS=0 does not reset SECONDS, or I'm missing something

From: Chet Ramey
Subject: Re: SECONDS=0 does not reset SECONDS, or I'm missing something
Date: Thu, 4 Jun 2020 15:02:13 -0400
User-agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.14; rv:68.0) Gecko/20100101 Thunderbird/68.8.1

On 6/4/20 2:57 PM, Tim Visher wrote:

>     Yes, SECONDS is in seconds granularity, whether that is seconds since the
>     epoch or seconds since an assignment to it, as you quoted below. There's
>     no expectation of subsecond granularity -- it's just whatever the system
>     tells the shell the current number of seconds is.
>     The next version will use the number of seconds returned from 
> gettimeofday,
>     but there's still nothing in there that attempts to round it up or down
>     depending on tv_usec.
> Thanks for that explanation, Chet. So do I understand it correctly that an
> assignment to SECONDS triggers an internal caching of `now` (I assume down
> to whatever granularity the underlying system supports) and the value
> that's assigned to SECONDS is used as the offset that's added to it? 

Yes, that's exactly how it works.

``The lyf so short, the craft so long to lerne.'' - Chaucer
                 ``Ars longa, vita brevis'' - Hippocrates
Chet Ramey, UTech, CWRU

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