Re: Use of |&

[Dennis Williamson]

On Mon, Feb 13, 2023 at 9:22 AM goncholden via <help-bash@gnu.org> wrote:

> Have been using awk in a bash script.
>
> Have seen the use of "|&" rather than the usual "|".  What is the reason
> for using
>
> "|&" exactly ?
>
> command |& getline info
>
> command | getline info



As Greg has said, in Bash |& is a pipe that passes both stdout and stderr.

However, the examples you show are AWK syntax (specifically gawk, perhaps)
for the creation of a coprocess as Alex has said. In this case it has
nothing to do with Bash.

https://www.gnu.org/software/gawk/manual/html_node/Two_002dway-I_002fO.html


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