"sudo: port: command not found" after installing MacPorts on Snow leopard
Solution 1:
It is probably a PATH issue.
By default port is installed the directory /opt/local/bin. Add the path 'opt/local/bin' as an extra line to the plain text file /etc/paths and you should be good.
Solution 2:
You can also add the following line to your ~/.bash_profile:
export PATH=$PATH:/opt/local/bin
This will add /opt/local/bin to the executable path and make your port command available to the shell.