title: Write symfony command log output to console AND FILE
body: <p>The setup is thus:</p>
  
  <p>I have a command, which calls a function on service X which uses logger Y.</p>
  
  <p>Currently, when run from the console, the log messages are output to the console (using the <code>-v</code> parameters). I would also like to output those messages to a file, regardless of the <code>-v</code> level.</p>
  
  <p><strong>Edit:</strong> Adding monolog config, as requested (though there's nothing interesting - it's the default).</p>
  
  <pre><code>monolog:
      channels: ['amz_update']
      handlers:
          main:
              type: stream
              path: '%kernel.logs_dir%/%kernel.environment%.log'
              level: emergency
              channels: ['!event']
          console:
              type: console
              process_psr_3_messages: false
              channels: ['!event', '!doctrine', '!console']
          # To follow logs in real time, execute the following command:
          # `bin/console server:log -vv`
          server_log:
              type: server_log
              process_psr_3_messages: false
              host: 127.0.0.1:9911
  </code></pre>