Any time I want to use ruby's ri tool, (e.g. after typing something like ri GC), after it shows the documentation, I can find no way of exiting it and none of the usual key combinations for terminating a command-line command works. Because of that I'm forced to close the whole terminal window to continue my works.
How can I quit normally from ri after it showed documentation?
The answer is to simply type
qand it will exit.