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Date: Wed, 19 Aug 2015 14:10:06 +0100
From: Stephane Chazelas <stephane.chazelas@gmail.com>
To: Peter Stephenson <p.stephenson@samsung.com>
Cc: Zsh hackers list <zsh-workers@zsh.org>
Subject: Re: mkdir builtin and $'\0'
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2015-08-19 10:52:50 +0100, Peter Stephenson:
[...]
> [Is there any future (not right now, obviously) in a shell variable that
> overrides the date/time that's output, for debugging?  I can think of
> cases where this would be really useful for debugging output from
> scripts that include timestamps and you want to diff different
> versions.  You could freeze the time to the same value, then run
> both versions, and get a controlled difference.]
[...]

Note that there's a "faketime" tool (using LD_PRELOAD) that can
be used to fake a particular time (and/or speed of time) which
is quite handy for testing date/calendar/timezone related things.

-- 
Stephane