From mboxrd@z Thu Jan  1 00:00:00 1970
From: Eric Sunshine <sunshine@sunshineco.com>
Subject: Re: [FEATURE REQUEST] Filter-branch extend progress with a simple
 estimated time remaning
Date: Sun, 30 Aug 2015 16:40:24 -0400
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On Sun, Aug 30, 2015 at 03:40:20PM -0400, Eric Sunshine wrote:
> I suppose a viable approach might be to test once outside the loop if
> "date +%s" is supported and print the "(%d elapsed / %d estimated
> remaining)" annotation within the loop if it is, else not. The test
> might look something like this:
> 
> echo $(date +%s) | grep -q '^[0-9][0-9]*$' 2>/dev/null && show_eta=t

Actually, you'd also want to suppress 'date' errors via /dev/null, so
perhaps:

  { echo $(date +%s) | grep -q '^[0-9][0-9]*$'; } 2>/dev/null && show_eta=t

or something.

> Platforms, such as Linux, Mac OS X, and FreeBSD, which support "date
> +%s" would get the annotated output, whereas it would fall back
> gracefully to the non-annotated output on platforms such as Solaris
> (and perhaps AIX) which lack it.