Ruby shell script realtime output

Question

script.sh

echo First!
sleep 5
echo Second!
sleep 5
echo Third!

another_script.rb

%x[./script.sh]

I want another_script.rb to print the output of script.sh as it happens. That means printing "First!", waiting five seconds, printing "Second!', waiting 5 seconds, and so on.

I've read through the different ways to run an external script in Ruby, but none seem to do this. How can I fulfill my requirements?

tadman · Accepted Answer · 2013-07-02 20:43:58Z

1

You can always execute this in Ruby:

system("sh", "script.sh")

Note it's important to specify how to execute this unless you have a proper #!/bin/sh header as well as the execute bit enabled.

answered Jul 2, 2013 at 20:43

tadman

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4 Comments

Zach Latta Over a year ago

The script has a proper shebang. system "./script.sh" produces the same results as %s[./script.sh]. I'm looking to print the script's output in real time as it happens, not get the script's output as the return value.

tadman Over a year ago

For me, it runs your script and shows the output correctly. Do you mean to capture the script's output and process it with Ruby? If so, you need to use popen3.

Zach Latta Over a year ago

Hmm, what version of Ruby are you using?

Zach Latta Over a year ago

Ah, got it working. Something was up with my RVM setup. Thanks!

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