/usr/bin/asciidoctor
/usr/bin/asciidoctor-safe
/usr/lib/ruby/gems/1.8/gems/asciidoctor-0.1.3/bin/asciidoctor
/usr/lib/ruby/gems/1.8/gems/asciidoctor-0.1.3/bin/asciidoctor-safe
You may install this package on CentOS with
yum
install rubygem-asciidoctor