How do I redirect stderr and stdout to file for a Ruby script?

ruby redirect stdout stderr
AOO picture AOO · Jun 10, 2010 · Viewed 33.1k times · Source

How do I redirect stderr and stdout to file for a Ruby script?

Answer

Mark Rushakoff picture Mark Rushakoff · Jun 10, 2010

From within a Ruby script, you can redirect stdout and stderr with the IO#reopen method.

# a.rb
$stdout.reopen("out.txt", "w")
$stderr.reopen("err.txt", "w")

puts 'normal output'
warn 'something to stderr'

$ ls
a.rb
$ ruby a.rb
$ ls
a.rb    err.txt out.txt
$ cat err.txt 
something to stderr
$ cat out.txt 
normal output

Related questions

How to apply before_filter to every action of every controller in Rails 3.2.11?

I'd like to verify if the user is logged in on every single request to the server. Something like: :before_filter verify_logged_in Where should I put that before_filter so it applies to all controller actions and all …

Read More
Detect redirect with ruby mechanize

I am using the mechanize/nokogiri gems to parse some random pages. I am having problems with 301/302 redirects. Here is a snippet of the code: agent = Mechanize.new page = agent.get('http://example.com/page1') The test server on …

Read More
How to check if a value exists in an array in Ruby

I have a value 'Dog' and an array ['Cat', 'Dog', 'Bird']. How do I check if it exists in the array without looping through it? Is there a simple way of checking if the value exists, nothing more?

Read More