我做

$brew install Nginx

得到：

==> Downloading http://Nginx.org/download/Nginx-1.2.2.tar.gz
Already downloaded: /Library/Caches/Homebrew/Nginx-1.2.2.tar.gz
==> Patching
patching file conf/Nginx.conf
==> ./configure --prefix=/usr/local/Cellar/Nginx/1.2.2 --with-http_ssl_module --with-pcre         --with-ipv6 --with-cc-opt=-I/usr/local/include --with-ld-opt=-L/usr/local/lib --conf
==> make
==> make install
==> Caveats
In the interest of allowing you to run `Nginx` without `sudo`,the default
port is set to localhost:8080.
If you want to host pages on your local machine to the public,you should 
change that to localhost:80,and run `sudo Nginx`. You'll need to turn off
any other web servers running port 80,of course.
You can start Nginx automatically on login running as your user with:
mkdir -p ~/Library/LaunchAgents
cp /usr/local/Cellar/Nginx/1.2.2/homebrew.mxcl.Nginx.plist ~/Library/LaunchAgents/
launchctl load -w ~/Library/LaunchAgents/homebrew.mxcl.Nginx.plist
Though note that if running as your user,the launch agent will fail if you
try to use a port below 1024 (such as http's default of 80.)
Warning: /usr/local/sbin is not in your PATH
You can amend this by altering your ~/.bashrc file 

我在〜/ .bashrc文件中有这个：

 export PATH=$PATH:/usr/local/sbin

当我运行Nginx -v或sudo Nginx -t我得到这个：

-bash: Nginx: command not found

我没有正确安装Nginx吗？