I don't use the RI or RDoc output from the gems I install in my machine or in the servers I handle (I use other means of documentation).
Every gem I install installs RI and RDoc documentation by default, because I forget to set --no-ri --no-rdoc.
Is there a way to make those two flags the default?
For Windows users, Ruby doesn't set up .gemrc file. So you have to create .gemrc file in your home directory (echo %USERPROFILE%) and put following line in it:
gem: --no-document
As already mentioned in previous answers, don't use --no-ri and --no-rdoc cause its deprecated. See it yourself:
gem help install