Manual pages for Ruby functions from command line

问题

Is there a way to get at the manuals of Ruby functions from the command line?

Like the ?func man pages in R.

回答1:

The ri tool might help here.

ri Array  
ri Array.sort  
ri Hash#each  
ri Math::sqrt  

回答2:

I have the following shell script that I use because it does color formatting in the terminal:

wesbailey@feynman:~/insiderpages> cat `which rim`
ri -Tf ansi -w 150 $1
wesbailey@feynman:~/insiderpages> rim Array

...

来源：https://stackoverflow.com/questions/5238468/manual-pages-for-ruby-functions-from-command-line