What is ruby?

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http://www.unix.com – Lately there have been a lot of one-liners posted in "ruby" on the apparent assumption that mainstream unix or Linux come with "ruby. They don't. What is "ruby"? What platforms and Operating System versions are supported? The syntax for "ruby" seems remarkably obscure compared with say "awk" or "perl". Is it related to APL? (HowTos)