On Mon, 11 Jan 2016, Chet Ramey wrote: > "The standard input for an asynchronous list, before any explicit > redirections are performed, shall be considered to be assigned to a file > that has the same properties as /dev/null."
I thought the (only) point of that to avoid a background job reading the tty in an environment that lacked job control. The standard is actually a bit vague; under "Compound Commands" it mentions that "Each redirection will apply to all the commands within the compound command that do not explicitly override that redirection" but it fails to mention that this applies to pipes as well; so I submit that it is a reasonable interpretation that a pipe on an outer block counts as an (explicit) redirection for the purpose of reading the "Asynchronous Lists" sub section. What do other shells do? Ksh? Dash? Zsh? -Martin
