How to log system command output in Rails under production mode?

Question

I'm calling a C executable in my Rails(-v 2.3.5) application using the system() call.

makefile_path = File.expand_path('./c_executalbe', Rails.root)
system(makefile_path)

Everything works fine on my local machine but for some reason that system() call won't run on the server(dreamhost). And there is no error message in log/production.log. I would like to see the returned output of that system call in the log. How can I do that?

Thanks in advance!

Fábio Batista · Accepted Answer · 2010-11-12 03:00:22Z

6

See: http://ruby-doc.org/core/classes/Kernel.html#M005960

Usage:

output = %x(command)
output = `command`
output = Kernel.send(:`, "command")

You'll get the command output.

If command comes from a variable, as in your case, you can interpolate:

output = %x(#{makefile_path})
output = `#{makefile_path}`
output = Kernel.send(:`, makefile_path)

To log it into log/production.log:

logger.info output
# or
puts output

edited Nov 12, 2010 at 3:00

answered Nov 12, 2010 at 2:49

Fábio Batista

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1 Comment

Omer Aslam Over a year ago

I am unable to log it on production using Logger.info(cmd_output). I am using thin server.

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