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Re: New MILLISECONDS “special” variable?

From: Chet Ramey
Subject: Re: New MILLISECONDS “special” variable?
Date: Thu, 2 Nov 2017 15:35:17 -0400
User-agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.12; rv:52.0) Gecko/20100101 Thunderbird/52.4.0

On 11/1/17 4:19 PM, Alan Dipert wrote:
> Hello all,
> I understand there is a “special” variable, SECONDS, which returns the
> number of seconds since bash invocation when referenced.
> Unfortunately for tasks like profiling one’s .profile, SECONDS is too
> coarse a unit. Milliseconds are more useful, but getting the time in
> milliseconds is only possibly by calling out to date. (At least, I’m not
> aware of a built-in way to get either Unix epoch or elapsed time in any
> sub-second unit) Shelling out to date isn’t desirable as it adds
> significant overhead and so complicates the task of profiling.

There is a special builtin in the devel branch version (EPOCHREALTIME) that
gives you the epoch time with microsecond resolution. It will be in the
next release.

``The lyf so short, the craft so long to lerne.'' - Chaucer
                 ``Ars longa, vita brevis'' - Hippocrates
Chet Ramey, UTech, CWRU    chet@case.edu    http://cnswww.cns.cwru.edu/~chet/

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