GNU bug report logs - #79369
seq generates wrong sequences for big numbers

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Pádraig Brady <P <at> draigBrady.com>
Cc: tracker <at> debbugs.gnu.org
Subject: bug#79369: closed (seq generates wrong sequences for big numbers)
Date: Tue, 02 Sep 2025 19:54:02 +0000

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Your message dated Tue, 2 Sep 2025 20:53:31 +0100
with message-id <536fa85d-1789-4548-bdfa-f12a9c51083e <at> draigBrady.com>
and subject line Re: bug#79369: seq generates wrong sequences for big numbers
has caused the debbugs.gnu.org bug report #79369,
regarding seq generates wrong sequences for big numbers
to be marked as done.

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


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79369: https://debbugs.gnu.org/cgi/bugreport.cgi?bug=79369
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From: <ondra007.tom <at> seznam.cz>
To: <bug-coreutils <at> gnu.org>
Subject: seq generates wrong sequences for big numbers
Date: Tue, 02 Sep 2025 14:11:28 +0200 (CEST)

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It looks like seq for integers bigger than 2^64 sometimes generate wrong 
results. There are few examples of wrong output I have found:


$ seq 18446744073709551617 inf | head -3

18446744073709551616
18446744073709551617
18446744073709551618





$  seq 10000000000000000000000000000 inf | head -3


9999999999999999999731564544
9999999999999999999731564545
9999999999999999999731564546





$  seq -1000000000000000000000000 0 | head -3


-1000000000000000000000000
-1000000000000000000000000
-1000000000000000000000000




It is similar to bug #75994 which reports the same issue but only for "-w"
option.

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From: Pádraig Brady <P <at> draigBrady.com>
To: ondra007.tom <at> seznam.cz, 79369-done <at> debbugs.gnu.org
Subject: Re: bug#79369: seq generates wrong sequences for big numbers
Date: Tue, 2 Sep 2025 20:53:31 +0100

On 02/09/2025 16:52, Pádraig Brady wrote:
> On 02/09/2025 13:11, ondra007.tom <at> seznam.cz wrote:
>> It looks like seq for integers bigger than 2^64 sometimes generate wrong
>> results. There are few examples of wrong output I have found:
>>
>>
>> $ seq 18446744073709551617 inf | head -3
>>
>> 18446744073709551616
>> 18446744073709551617
>> 18446744073709551618
>>
>>
>>
>>
>>
>> $  seq 10000000000000000000000000000 inf | head -3
>>
>>
>> 9999999999999999999731564544
>> 9999999999999999999731564545
>> 9999999999999999999731564546
> 
> We can improve for the above 2 cases anyway,
> with something like the attached.
> 
> Large magnitude negative start values are still problematic.

Ok I pushed that with a test included:https://github.com/coreutils/coreutils/commit/701416709
Marking this as done.

thanks,
Padraig

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