title: R Sessions Verbosity / Silent R Sessions
body: <p>I'm trying to write code that logs only comments that I have excplicity <code>cat</code>ed or <code>print</code>ed and ignores all the text that some of of the command generate themselves, eg. loading of a library usually generates some text which the end user doesn't care about, but the user cares about a certain calculation that I'm running which I've manually inserted a message for.</p>
  
  <p>I've been using <code>invisible</code>, `suppressMessages', and the likes but is there a way to globally declare all these so that the canned messages are suppressed / invisible and only my messages are output to the screen / logs?</p>