Redirect two or more STDOUT to a single STDIN

Question

I would like to redirect the output of two programs to a single STDIN pipe, possibly in the most efficient way possible.

Is that possible?

What have you tried so far and it's not clear what your input is and what your output is. — SMA, Nov 15 '14 at 17:09

score 5 · Accepted Answer · answered Nov 15 '14 at 17:09

5

Yes.

{ command1 ; command2 ; } | command3

answered Nov 15 '14 at 17:09

So basically create a third program that has the first two running in background and redirects it's output. Makes a lot of sense, I should have thought of it. Thank you. – cedivad Nov 15 '14 at 17:14
Is it recognizable for `command3`? I mean what is order of piping. Is it a first and second scenario or they go through each other? – muradin Nov 15 '14 at 19:25
@muradin: The command grouping assures that `command1` and `command2` both use the same stdout. – Ignacio Vazquez-Abrams Nov 15 '14 at 19:53
@cedivad: Nothing is running in the background in Ignacio's answer. The braces `{` and `}` enclose a _group command_. See the bash man under `Compound Commands`. – PM 2Ring Nov 16 '14 at 10:20
Yes, I confused `;` with `&`. Replacing them did the trick anyway. It created another problem, and I ended up using a completely different solution, but did what was asked in the question. – cedivad Nov 17 '14 at 10:41

1 Answers1