[builder@localhost .in]$ rpm -q asciidoctor
asciidoctor-2.0.26-alt1.noarch

[builder@localhost .in]$ asciidoctor 
-bash: /usr/bin/asciidoctor: cannot execute: required file not found
[builder@localhost .in]$ cat /usr/bin/asciidoctor
#!/usr/lib/ruby/bin/ruby
# frozen_string_literal: true

asciidoctor = File.absolute_path '../lib/asciidoctor.rb', __dir__
if File.exist? asciidoctor
  require asciidoctor
  require File.join Asciidoctor::LIB_DIR, 'asciidoctor/cli'
else
  require 'asciidoctor'
  require 'asciidoctor/cli'
end

invoker = Asciidoctor::Cli::Invoker.new ARGV
GC.start
invoker.invoke!
exit invoker.code[builder@localhost .in]$ 
[builder@localhost .in]$ which ruby 
which: no ruby in (/usr/src/bin:/usr/bin:/bin:/usr/local/bin:/usr/games)
[builder@localhost .in]$ ls -al /usr/lib/ruby/bin/ruby
ls: cannot access '/usr/lib/ruby/bin/ruby': No such file or directory