JRuby Small Memos

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$ jruby --version
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$ jruby -e "puts 'This is a short program'"
This is a short program
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$ jirb
irb(main):001:0> ['Hello', 'world'].join ' '
=> "Hello world"
irb(main):002:0> "ybuRJ morf".reverse
=> ufrom JRuby"
irb(main):003:0>