On 6/22/21 5:42 AM, Martin Jambon wrote:
Hello!
I ran into something that looks like a bug to me, although I'm not super
familiar curly-brace command groups.
It's not the brace command; it's the pipeline.
Minimal repro:
$ sleep 1 & { wait $!; } | cat
[1] 665454
bash: wait: pid 665454 is not a child of this shell
I was expecting a success, just like we get without the pipeline:
The pipeline does, in fact, make the difference. Each process in a pipeline
is run in a subshell, and that subshell isn't the parent of the previously-
created asynchronous job. You can't wait for a process that isn't one of
your children.
--
``The lyf so short, the craft so long to lerne.'' - Chaucer
``Ars longa, vita brevis'' - Hippocrates
Chet Ramey, UTech, CWRU c...@case.edu http://tiswww.cwru.edu/~chet/
