Do I have RubyGems installed but just can't find it?

I am working through Beginning Ruby by Cooper, and have hit a slight snag: I can’t figure out if I have RubyGems installed on my MacBook. I just upgraded to SnowLeopard, so it should be in there somewhere, but when I type gem and press Enter, I get the error "Wrong number of arguments (0 for 1). Was wondering if someone could give me a hint on how to determine if RubyGems is installed.

Thank you!

You have to supply an argument to the gem command.

For example, gem -v should return the version number and gem -h should pull up the help file which will be very beneficial for you.

You can also try:

$ gem environment

which will display a lot of useful information.

Thank you that was very helpful!