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Date: Thu, 13 Feb 2025 14:45:39 +0800
From: lilydjwg <lilydjwg@HIDDEN>
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In the past I can run `cat` without any arguments and it prints
whatever I type at the terminal. However since 9.6, `cat` reports the
following error:

cat: -: input file is output file

-- 
Best regards,
lilydjwg




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From: help-debbugs@HIDDEN (GNU bug Tracking System)
To: lilydjwg <lilydjwg@HIDDEN>
Subject: bug#76255: Acknowledgement (cat: error without arguments)
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merge 76255 76256 76257




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Subject: bug#76255: closed (cat: error without arguments)
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Your message dated Fri, 14 Feb 2025 22:22:02 -0800
with message-id <7329a667-825a-4e70-9208-7c6426e38c97@HIDDEN>
and subject line Re: bug#76255: cat: error without arguments
has caused the debbugs.gnu.org bug report #76255,
regarding cat: error without arguments
to be marked as done.

(If you believe you have received this mail in error, please contact
help-debbugs@HIDDEN)


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76255: https://debbugs.gnu.org/cgi/bugreport.cgi?bug=3D76255
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From: lilydjwg <lilydjwg@HIDDEN>
To: bug-coreutils@HIDDEN
Subject: cat: error without arguments
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In the past I can run `cat` without any arguments and it prints
whatever I type at the terminal. However since 9.6, `cat` reports the
following error:

cat: -: input file is output file

-- 
Best regards,
lilydjwg



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Subject: Re: bug#76255: cat: error without arguments
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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.
--------------FHzgNDhPoG0gRkS8az07oGCT
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To: lilydjwg <lilydjwg@HIDDEN>
Subject: bug#76255: closed (Re: bug#76255: cat: error without arguments)
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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 76255 <at> debbugs.gnu.org.

--=20
76255: https://debbugs.gnu.org/cgi/bugreport.cgi?bug=3D76255
GNU Bug Tracking System
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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.
--------------FHzgNDhPoG0gRkS8az07oGCT
Content-Type: text/x-patch; charset=UTF-8;
 name="0001-cat-fix-plain-cat-bug.patch"
Content-Disposition: attachment; filename="0001-cat-fix-plain-cat-bug.patch"
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From: lilydjwg <lilydjwg@HIDDEN>
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Subject: cat: error without arguments
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In the past I can run `cat` without any arguments and it prints
whatever I type at the terminal. However since 9.6, `cat` reports the
following error:

cat: -: input file is output file

-- 
Best regards,
lilydjwg



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Subject: bug#76256: closed (cat: error without arguments)
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On Thu, Feb 13, 2025 at 02:45:39PM +0800, lilydjwg wrote:
> In the past I can run `cat` without any arguments and it prints
> whatever I type at the terminal. However since 9.6, `cat` reports the
> following error:
> 
> cat: -: input file is output file

Ah, I find it's not always reproducible, and a strace reveals that the
stdout flags are different:

Erroring cat (in my existing shell session):

fcntl(1</dev/pts/5<char 136:5>>, F_GETFL) = 0x402 (flags O_RDWR|O_APPEND)

Working cat (in a new shell session):

fcntl(1</dev/pts/11<char 136:11>>, F_GETFL) = 0x2 (flags O_RDWR)

I'm using zsh, and this issue starts to occur after I do a tab
completion (in my case, type "cat" and then tab). Other users report
that some fish completion can also cause this issue.

The terminal in use itself seems to not matter. I'm using GNOME
Terminal, inside and outside tmux.

-- 
Best regards,
lilydjwg



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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.
--------------FHzgNDhPoG0gRkS8az07oGCT
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To: lilydjwg <lilydjwg@HIDDEN>
Subject: bug#76256: closed (Re: bug#76255: cat: error without arguments)
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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 76256 <at> debbugs.gnu.org.

--=20
76255: https://debbugs.gnu.org/cgi/bugreport.cgi?bug=3D76255
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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.
--------------FHzgNDhPoG0gRkS8az07oGCT
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Date: Thu, 13 Feb 2025 15:13:58 +0800
From: lilydjwg <lilydjwg@HIDDEN>
To: bug-coreutils@HIDDEN
Subject: Re: cat: error without arguments
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On Thu, Feb 13, 2025 at 02:45:39PM +0800, lilydjwg wrote:
> In the past I can run `cat` without any arguments and it prints
> whatever I type at the terminal. However since 9.6, `cat` reports the
> following error:
> 
> cat: -: input file is output file

Ah, I find it's not always reproducible, and a strace reveals that the
stdout flags are different:

Erroring cat (in my existing shell session):

fcntl(1</dev/pts/5<char 136:5>>, F_GETFL) = 0x402 (flags O_RDWR|O_APPEND)

Working cat (in a new shell session):

fcntl(1</dev/pts/11<char 136:11>>, F_GETFL) = 0x2 (flags O_RDWR)

I'm using zsh, and this issue starts to occur after I do a tab
completion (in my case, type "cat" and then tab). Other users report
that some fish completion can also cause this issue.

The terminal in use itself seems to not matter. I'm using GNOME
Terminal, inside and outside tmux.

-- 
Best regards,
lilydjwg



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From: lilydjwg <lilydjwg@HIDDEN>
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Subject: Re: cat: error without arguments
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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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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.
--------------FHzgNDhPoG0gRkS8az07oGCT
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To: lilydjwg <lilydjwg@HIDDEN>
Subject: bug#76257: closed (Re: bug#76255: cat: error without arguments)
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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.

--=20
76255: https://debbugs.gnu.org/cgi/bugreport.cgi?bug=3D76255
GNU Bug Tracking System
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Subject: Re: bug#76255: cat: error without arguments
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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.
--------------FHzgNDhPoG0gRkS8az07oGCT
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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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 ---- ---------------------- --------------------------------------------------
 -0.0 RCVD_IN_DNSWL_NONE     RBL: Sender listed at https://www.dnswl.org/,
 no trust [2a00:1450:4864:20:0:0:0:42c listed in]
 [list.dnswl.org]
 0.0 SPF_HELO_NONE          SPF: HELO does not publish an SPF Record
 -0.0 SPF_PASS               SPF: sender matches SPF record
 0.0 FREEMAIL_FROM          Sender email is commonly abused enduser mail
 provider (pixelbeat[at]gmail.com)
 0.0 HEADER_FROM_DIFFERENT_DOMAINS From and EnvelopeFrom 2nd level
 mail domains are different
 1.8 MISSING_SUBJECT        Missing Subject: header
 0.2 NO_SUBJECT             Extra score for no subject
 0.0 FREEMAIL_FORGED_FROMDOMAIN 2nd level domains in From and
 EnvelopeFrom freemail headers are different
X-Debbugs-Envelope-To: control
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Sender: "Debbugs-submit" <debbugs-submit-bounces <at> debbugs.gnu.org>
X-Spam-Score: 1.0 (+)

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Last modified: Tue, 1 Jul 2025 22:45:03 UTC

GNU bug tracking system
Copyright (C) 1999 Darren O. Benham, 1997 nCipher Corporation Ltd, 1994-97 Ian Jackson.