GNU bug report logs - #76255
cat: error without arguments

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: lilydjwg <lilydjwg <at> gmail.com>
Subject: bug#76257: closed (Re: bug#76255: cat: error without arguments)
Date: Sat, 15 Feb 2025 06:23:03 +0000

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Your bug report

#76255: cat: error without arguments

which was filed against the coreutils package, has been closed.

The explanation is attached below, along with your original report.
If you require more details, please reply to 76257 <at> debbugs.gnu.org.

-- 
76255: https://debbugs.gnu.org/cgi/bugreport.cgi?bug=76255
GNU Bug Tracking System
Contact help-debbugs <at> gnu.org with problems

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From: Paul Eggert <eggert <at> cs.ucla.edu>
To: lilydjwg <lilydjwg <at> gmail.com>
Cc: 76255-done <at> debbugs.gnu.org
Subject: Re: bug#76255: cat: error without arguments
Date: Fri, 14 Feb 2025 22:22:02 -0800

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On 2025-02-12 22:45, lilydjwg wrote:
> cat: -: input file is output file

Thanks for the bug report. The symptoms you observe are a bug in 'cat'. 
I also see a bug in Gawk which I reported to the Gawk maintainer 
<https://lists.gnu.org/r/bug-gawk/2025-02/msg00003.html>. I don't see a 
bug in zsh or fish but perhaps I'm missing something.

To fix the 'cat' bug I installed the attached patch into bleeding-edge 
Coreutils on Savannah, and something like this patch should appear in 
the next release.

[0001-cat-fix-plain-cat-bug.patch (text/x-patch, attachment)]

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From: lilydjwg <lilydjwg <at> gmail.com>
To: bug-coreutils <at> gnu.org
Subject: Re: cat: error without arguments
Date: Thu, 13 Feb 2025 15:21:57 +0800

On Thu, Feb 13, 2025 at 03:13:59PM +0800, lilydjwg wrote:
> [...]
> fcntl(1</dev/pts/5<char 136:5>>, F_GETFL) = 0x402 (flags O_RDWR|O_APPEND)

This flag is added by gawk. Run "awk '{print $1}'" and Ctrl-D, and
then cat will print this error. No shell completion needed to reproduce.

> [...]

-- 
Best regards,
lilydjwg

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