Re: Piping wc causes error

Kye Hunter <[email protected]> Tue, 23 Dec 2025 09:53:05 +0100

Newsgroups	gmane.comp.shells.bash.bugs
Message-ID	<[email protected]>

Hi Chet,

Thanks for the info!

-Kye

On 12/15/25 9:34 PM, Chet Ramey wrote:
> On 12/13/25 7:53 AM, Kye Hunter wrote:
>
>> Bash Version: 5.3
>> Patch Level: 8
>> Release Status: release
>>
>> Description:
>> To start, I'm not totally sure if this is a bug with bash or with wc, 
>> as wc is the only program I have noticed this behavior in, but this 
>> seems like a good place to start.
>
> It's neither. It's not a bug at all, in fact. You correctly identify the
> issue:
>
>
>> The inconsistent behavior makes this seem like a race, perhaps, in 
>> the script below, head is trying to close the pipe before wc finishes 
>> writing to it, causing it to return the error.
>
> But it doesn't have anything to do with bash. Consider the following
> sequence (at this point, bash is not in the picture; it's waiting for
> its children to terminate):
>
> wc writes the first line (of 7) to stdout, a pipe
> head reads the first line from the pipe
> head writes the single line to its stdout
> head exits with status 0
> wc writes the second line to stdout
> wc receives SIGPIPE, a fatal signal, and exits as a result
>
> after which
>
> bash collects head's termination status (0)
> bash collects wc's termination status and converts it to 141 (128 + 
> SIGPIPE)
> pipefail is set, so bash sets $? to 141
>
> This is just how pipes work. Writing on a pipe with no reader, and 
> exiting
> due to the resultant SIGPIPE, is common and expected. You would never 
> have
> noticed if you hadn't enabled `pipefail'.
>

-- 
Kye E. Hunter
PGP: 6859 E2DE D598 49EA 9319  10CD DEF2 BA03 A6BE 3062
--

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