Catching command-line errors using %x

Question

Whenever you want to execute something on the command line, you can use the following syntax:

%x(command to run)

However, I want to catch a

Answer 1

You might want to redirect stderr to stdout:

result = %x(command to run 2>&1)

Or if you want to separate the error messages from the actual output, you can use popen3:

require 'open3'
stdin, stdout, stderr = Open3.popen3("find /proc")

Then you can read the actual output from stdout and error messages from stderr.