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up vote 3 down vote favorite

Is it possible to combine output from these two commands?

node ~/projects/trunk/index.js 
python ~/projects/trunk/run.py run

Neither command exits so I'm not sure how to do this.

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1  
If the programs don't finish, presumably they write output continuously? What do yo want to do with their output? Interleave lines, ...? Why do you want to do this? – vonbrand Feb 14 at 0:37
The node command doesn't output much, but it still needs to run. The python one outputs all requests, I want to capture both and watch them both in the same shell window. – chovy Feb 14 at 5:23

3 Answers

up vote 0 down vote accepted

I ended up doing this, the other suggestions did not work, as the 2nd command was either killed or never executed.

alias app () {
    nohup python ~/projects/trunk/run.py run 1>/tmp/log 2>&1 &
    echo $! > /tmp/api.pid
    nohup node ~/projects/trunk/index.js 1>/tmp/log 2>&1 &
    echo $! > /tmp/client.pid
    tail -f /tmp/log
}
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up vote 0 down vote

Try this:

paste $(node ~/projects/trunk/index.js) $(python ~/projects/trunk/run.py run) > outputfile

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what does 'paste' do? – chovy Feb 14 at 5:24
@chovy, see here: techrepublic.com/article/… Not sure if it'll work in this context though. – Lorax Feb 14 at 10:59
I don't think paste is appropriate here, as it is meant to put columns next to eachother – Bernhard Feb 15 at 22:06
@Bernhard indeed. But it wasn't specified in the req's – frogstarr78 Feb 16 at 3:04
@frogstarr78 I think it is highly unlikely that this is what he wants, but you are right, it is not specified. – Bernhard Feb 16 at 10:24
up vote 4 down vote

You can combine two commands by grouping it with { } :

{ command1 & command2; }

so far, you can redirect the group to a file :

{ command1 & command2; } > new_file

if you want to separate STDOUT and STDERRin two files :

{ command1 & command2; } > STDOUT_file 2> STDERR_file
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1  
OP says the programs don't finsh... – vonbrand Feb 14 at 0:35
Doesn't matter that they programs don't finish. 'tail -f' doesn't "finish" either, but this still works and combines the outputs of both programs. Works for more than two commands as well. ^c to quit kills only one of the grouped commands. You'll have to kill the other's manually, though. – SuperMagic Feb 14 at 4:58

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