mainThe GNU Bourne-Again SHell - Support: sr #110335, Interrupt in command substitution...


sr #110335: Interrupt in command substitution exits interactive bash

Submitter:  Robert Hensing <roberth>
Submitted:  Tue 20 Oct 2020 11:31:38 AM UTC
Votes:  50  
Category:  None Priority:  5 - Normal
Severity:  3 - Normal Status:  Done
Privacy:  Public Assigned to:  None
Open/Closed:  Open Operating System:  None
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Mon 21 Dec 2020 02:31:51 PM UTC, comment #7: 

This is fixed in bash-5.1.

Chet Ramey <chet>
Project Administrator
Sun 20 Dec 2020 11:30:08 PM UTC, comment #6: 

I can reproduce reliably this way.

In the following environment:

$ type _direnv_hook
_direnv_hook is a function
_direnv_hook ()
    local previous_exit_status=$?;
    trap -- '' SIGINT;
    eval "$("/nix/store/21f554786n26jy6nq2z9xp8687zi0ach-direnv-2.25.0/bin/direnv" export bash)";
    trap - SIGINT;
    return $previous_exit_status
$ ls -a
.  ..  .direnv  .envrc  shell.nix
$ cat .envrc
use nix
$ cat shell.nix
(import <nixpkgs> { }).mkShell {
  name = "test";
$ bash --version
GNU bash, version 4.4.23(1)-release (x86_64-apple-darwin17.7.0)
Copyright (C) 2016 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <>

This is free software; you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.
$ which bash

I hold down Ctrl-C to spam SIGINT to bash. It will exit after a few seconds of this. I'm not sure what aspect of my environment is causing this, but setting PROMPT_COMMAND='' seems to make it stop happening.

Luke Worth <lrworth>
Mon 26 Oct 2020 01:05:25 PM UTC, comment #5: 
Chet Ramey <chet>
Project Administrator
Wed 21 Oct 2020 04:46:25 PM UTC, comment #4: 

This behavior seems to be triggered by direnv, but it can not be fixed by direnv. See for discussion and yet another way to trigger the problem.

Robert Hensing <roberth>
Tue 20 Oct 2020 02:47:14 PM UTC, comment #3: 

I tested on macOS and Fedora 31, and I did ^C it.

Chet Ramey <chet>
Project Administrator
Tue 20 Oct 2020 02:01:32 PM UTC, comment #2: 

It happens for me with bash 5.0-p18 on NixOS, which has no extra patches besides enabling PGRP_PIPE.

Just in case, you did send a Ctrl+C, right? I didn't state clearly that you have to ^C it yourself.

Robert Hensing <roberth>
Tue 20 Oct 2020 12:17:42 PM UTC, comment #1: 

I can't reproduce this using similar conditions as #108593 with
bash-5.0 or bash-5.1-rc1.

Chet Ramey <chet>
Project Administrator
Tue 20 Oct 2020 11:31:38 AM UTC, original submission:  

To reproduce

bash$ echo $(sleep 10)

This exits the bash process, typically causing terminal emulator windows to close. I've tested this in Konsole, xfce4-terminal, xterm and gnome-terminal.

Interrupting sleep 10 by itself works just fine.
Variations with command substitution in a different 'role' produce the same outcome. For example $(sleep 10) by itself or a=$(sleep 10).

This is similar to but distinct from which is about process substitution and has been resolved.

Robert Hensing <roberth>


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  • -email is unavailable- added by lrworth (Posted a comment)
  • -email is unavailable- added by lrworth (Voted in favor of this item)
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  • -email is unavailable- added by chet (Posted a comment)
  • -email is unavailable- added by roberth (Submitted the item)

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    Follow 4 latest changes.

    Date Changed by Updated Field Previous Value => Replaced by
    2020-12-21 chet StatusWorks For Me Done
    2020-12-20 lrworth Carbon-Copy- Added lrworth
    2020-10-22 arne Carbon-Copy- Added -email is unavailable-
    2020-10-20 chet StatusNone Works For Me

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