Hi guys. I'm kinda a newbie using linux, and I'm having trouble using the asciidoctor.
I was following the installation guide and I used the commands:
$ gem install asciidoctor
and it went just fine. Problem is that in the guide there is in the section Usage the following code:
$ asciidoctor --version
but then I got the following error.

and as you can see asciidoctor is listed in the local list.
What I'm doing wrong here?