How to make --no-ri --no-rdoc the default for gem install?

You just add the following line to your local ~/.gemrc file (it is in your home folder):

gem: --no-document

echo 'gem: --no-document' >> ~/.gemrc

or you can add this line to the global gemrc config file.

Here is how to find it (in Linux):

strace gem source 2>&1 | grep gemrc

The --no-document option is documented in the RubyGems CLI Reference.

From RVM’s documentation:

Just add this line to your ~/.gemrc or /etc/gemrc:

gem: --no-document

Note: The original answer was:

install: --no-rdoc --no-ri 
update: --no-rdoc --no-ri

This is no longer valid; the RVM docs have since been updated, thus the current answer to only include the gem directive is the correct one.

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