GNU bug report logs - #49217
'shuf' returns nothing if the low range number is higher by 1 than the high number

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Paul Eggert <eggert <at> cs.ucla.edu>
Cc: tracker <at> debbugs.gnu.org
Subject: bug#49217: closed ('shuf' returns nothing if the low range number
 is higher by 1 than the high number)
Date: Fri, 25 Jun 2021 04:20:02 +0000

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Your message dated Thu, 24 Jun 2021 21:19:36 -0700
with message-id <8ae9edf4-7e65-847a-bfb9-8074853810e4 <at> cs.ucla.edu>
and subject line Re: bug#49217: 'shuf' returns nothing if the low range number is higher by 1 than the high number
has caused the debbugs.gnu.org bug report #49217,
regarding 'shuf' returns nothing if the low range number is higher by 1 than the high number
to be marked as done.

(If you believe you have received this mail in error, please contact
help-debbugs <at> gnu.org.)


-- 
49217: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=49217
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Contact help-debbugs <at> gnu.org with problems

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From: F8ER F8ER <the.f8er <at> gmail.com>
To: bug-coreutils <at> gnu.org
Subject: 'shuf' returns nothing if the low range number is higher by 1 than
 the high number
Date: Fri, 25 Jun 2021 01:46:30 +0200

Dear GNU Developers,


Thank you very much for the project.


It seems, if the low range number is higher by 1 than the high number,
the program returns

nothing (with exit code = 0), while 102-100 results in an error and
100-100 returns 100 as expected.

For example, `shuf -i 101-100 -n 1` returns nothing with the exit code
= 0 (unexpected).


Expected (normal):

`shuf -i 100-101 -n 1` returns either 100 or 101 with an exit code = 0.

`shuf -i 100-100 -n 1` returns 100 with an exit code = 0.

`shuf -i 102-100 -n 1` results in an error with an exit code = 1.


Is that an expected behavior?


Stay safe!


Best and kind regards

[Message part 3 (message/rfc822, inline)]

From: Paul Eggert <eggert <at> cs.ucla.edu>
To: F8ER F8ER <the.f8er <at> gmail.com>
Cc: 49217-done <at> debbugs.gnu.org
Subject: Re: bug#49217: 'shuf' returns nothing if the low range number is
 higher by 1 than the high number
Date: Thu, 24 Jun 2021 21:19:36 -0700

On 6/24/21 4:46 PM, F8ER F8ER wrote:
> For example, `shuf -i 101-100 -n 1` returns nothing with the exit code
> = 0 (unexpected).

Actually, it's the expected behavior. It's the same behavior as 'shuf -n 
1 </dev/null'. The '-n 1' option does not mean "output exactly 1 line"; 
it means "output at most 1 line".

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