退出RI的正确方法是什么？

Question

What is the right combination for exit RI on Ubuntu(13.04)?

For example, the following line:

ri GC::enable

gives me:

pressing the following commands do nothing: PAUSE/BREAK, Home, End, Ctrl+Shift+D

The only thing that exist is ctrl+c but it throws errors like this:

from /home/gotqn/.rvm/gems/ruby-2.0.0-p247/gems/rdoc-4.0.1/lib/rdoc/ri/driver.rb:774:in display_class' from /home/gotqn/.rvm/gems/ruby-2.0.0-p247/gems/rdoc-4.0.1/lib/rdoc/ri/driver.rb:800:in display_name' from /home/gotqn/.rvm/gems/ruby-2.0.0-p247/gems/rdoc-4.0.1/lib/rdoc/ri/driver.rb:827:in block in display_names' from /home/gotqn/.rvm/gems/ruby-2.0.0-p247/gems/rdoc-4.0.1/lib/rdoc/ri/driver.rb:824:in each' from /home/gotqn/.rvm/gems/ruby-2.0.0-p247/gems/rdoc-4.0.1/lib/rdoc/ri/driver.rb:824:in display_names' from /home/gotqn/.rvm/gems/ruby-2.0.0-p247/gems/rdoc-4.0.1/lib/rdoc/ri/driver.rb:1361:in run' from /home/gotqn/.rvm/gems/ruby-2.0.0-p247/gems/rdoc-4.0.1/lib/rdoc/ri/driver.rb:356:in run' from /home/gotqn/.rvm/gems/ruby-2.0.0-p247/gems/rdoc-4.0.1/bin/ri:12:in ' from /home/gotqn/.rvm/gems/ruby-2.0.0-p247/bin/ri:23:in load' from /home/gotqn/.rvm/gems/ruby-2.0.0-p247/bin/ri:23:in ' from /home/gotqn/.rvm/gems/ruby-2.0.0-p247/bin/ruby_noexec_wrapper:14:in eval' from /home/gotqn/.rvm/gems/ruby-2.0.0-p247/bin/ruby_noexec_wrapper:14:in eval' from /home/gotqn/.rvm/gems/ruby-2.0.0-p247/bin/ruby_noexec_wrapper:14:in '

and something more, even it seems the RI has been stopped, but pressing any of the keys gives me again this:

Answer 1

Press q .

ri pipes the output through what's called a pager. The pager on most systems is a program that is named either more or less . See the manpages for those commands for more information ( man more or man less ).

You can set your pager through the environment variable PAGER in the shell. For example on my machine in bash:

> echo $PAGER
/usr/bin/less

Answer 2

Just press q .

It's the same as exiting man pages.

Answer 3

▶ ri -i

Enter the method name you want to look up.
You can use tab to autocomplete.
Enter a blank line to exit.

>> 

Like it says.

You can also use ctrl d to indicate end of input from your keyboard device if you used ri -i for interactive mode.

Now if it opened up your pager, then q may work (if it is less , for example) otherwise see the man ual for your pager.