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ruby

Ruby programming language interpreter. More information: https://www.ruby-lang.org.

Start a REPL (interactive shell):

irb

Execute a Ruby script:

ruby {{script.rb}}

Execute a single Ruby command in the command-line:

ruby -e {{command}}

Check for syntax errors on a given Ruby script:

ruby -c {{script.rb}}

Show the version of Ruby you are using:

ruby -v