bug#12689: 24.2; Eshell ${cmd} substitution

[Samer Masterson]

On Tue, Mar 3, 2015 at 7:54 AM, Eli Zaretskii <eliz@gnu.org> wrote:

Does this have any effect on the feature where Eshell can run several commands simultaneously via a shell-like pipe? Thanks.

I don't know what feature you're describing. Here is the output from running regular pipes:

~ $ echo hello | /bin/echo there | /bin/echo hey | echo hi # Without patch

hi

hey

~ $ echo hello | /bin/echo there | /bin/echo hey | echo hi # With patch

hi

hey

there

hello

First, we should ignore the fact that echo does nothing with stdin, and the above commands print "hi" in bash. I do not understand why the command without the patch only prints out "hey\nhi", but it printed that consistently on my computer. The second output is incorrect (or at the very least unexpected?), but less incorrect than the first. If this is what you were talking about, then the commands may have appeared to be simultaneous because they were racing, but I'm not sure if that's intentional.