<<starting mysql in virtual rails question>>

I have virtual machine and virtual rails installed on my machine. I
opened up a terminal to start the rubystack version of MySQL by typing
the following:

/opt/rubystack-2.0-0

when I do this I get the following message:

bash: /opt/rubystack-2.0-0: is a directory

I am new to this and this is what was instructed in the tutorial on
virtualrails.org. I am trying to navigate to the directory so I can
start the MySQL. What am I doing wrong?

Open a terminal, navigate to the /opt/rubystack-2.0-0 folder, and run
“sudo
./ctlscript.sh start”