Closing this bug, per the discussion.
I don't think I'd expect using "&" to do something useful for this case;
I'm somewhat surprised it works in bash.
"&" means "fork off a child process for this pipeline"; the original
shell executed by popen() would then have nothing left to do, and could
properly exit. I suppose bash may hang around for its jobs to finish, if
it detects it's not interactive.
** Changed in: dash (Ubuntu)
Status: Unconfirmed => Rejected
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popen() C call behaviour changes from bash to dash
https://bugs.launchpad.net/bugs/69930
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