bug#15425: mktemp - conflicting options affected by ENV

[Pádraig Brady]

On 09/26/2013 05:36 AM, Jim Meyering wrote:
>> I'll push this soon, unless there are objections
>> to the above "undeprecation" of -p.
> 
> Go for it. That seems best.  Thank you.

That -p = --tmpdir aspect is OK.

But on consideration, erroring on -p,-t is too harsh.
Really -t is just a mode to operate in,
i.e. enforce no '/' in template, and give precedence
to TMPDIR over --tmpdir
Hopefully the attached documentation only patch
suffices to clear things up.

BTW I noticed this variation which could be
used to generate passwords or something:

 $ mktemp -u -t -p '' XXXXXXXX
 L5awccB1

However without -t, '/tmp/' is inserted.
I'm inclined to change to not output '/tmp/' here?

 $ mktemp -u -p '' XXXXXXXX
 /tmp/L5awccB1

thanks,
Pádraig.

mktemp-pt.patch
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