Can't create a bare repository

Hi,
I'm just starting using Git and I want to use it mainly for web development. I'm
following this guide:

http://toroid.org/ams/git-website-howto

(anyway, better suggestions are really appreciated)
I'm at the point where I have to create a bare repository on the server, but
when I give the command "git init --bare" I get this output:

usage: git-init [-q | --quiet] [--template=<template-directory>] [--shared]

It seems like it's not a valid command.

Any idea?