Как проверить версию Ruby
// Command line:
$ ruby -v
// Within irb type "RUBY_VERSION"
# => "2.4.1"
// If using RVM:
$ rvm current
# => ruby-2.4.1
CodeBaron
// Command line:
$ ruby -v
// Within irb type "RUBY_VERSION"
# => "2.4.1"
// If using RVM:
$ rvm current
# => ruby-2.4.1
rvm list
rvm rubies
ruby-1.9.1-p431 [ i386 ]
=* ruby-1.9.2-p320 [ i386 ]
# => - current
# =* - current && default
# * - default