Manual pages for Ruby functions from command line

Is there a way 开发者_StackOverflow中文版to get at the manuals of Ruby functions from the command line?

Like the ?func man pages in R.

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The ri tool might help here.

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

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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

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