I am trying to get StarCluster's tab completion to work. Quoting the documentation:
to enable StarCluster bash-completion support for every shell you open, add the following line to your ~/.bashrc file:
source /path/to/starcluster/completion/starcluster-completion.sh
But I can not find the script file anywhere. I searched my machine, and I also search the starcluster github project. I can't find it anywhere.
Where is the file located?
You may simply need to create the file.
~/.bashrc is run whenever you start a shell, and provides user-specific customization of your shell environment. It lives in your home directory, so every user can have a (different) one. That is to say, until you start customizing your shell environment, your ~/.bashrc is probably empty, if it exists at all.
The no-brainer way to do this would be:
echo "source /path/to/starcluster/completion/starcluster-completion.sh" >> ~./bashrc
This will append the line to the end of your ~/.bashrc, and create the file if it doesn't already exist. Otherwise you can create a file with your favorite text editor and put the line in it.
EDIT: The OP's problem was not appending to $PATH. It was in finding the starcluster-completion.sh script in order to source it.
You can find the starcluster-completion.sh script here: https://github.com/jtriley/StarCluster/blob/develop/completion/starcluster-completion.sh