/usr/bin/irb2.0 is in ruby2.0 2.0.0.484-1ubuntu2.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 | #!/usr/bin/ruby2.0
#
# irb.rb - interactive ruby
# $Release Version: 0.9.6 $
# $Revision$
# by Keiju ISHITSUKA(keiju@ruby-lang.org)
#
require "irb"
if __FILE__ == $0
IRB.start(__FILE__)
else
# check -e option
if /^-e$/ =~ $0
IRB.start(__FILE__)
else
IRB.setup(__FILE__)
end
end
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