It’s a Bash script that lets you export a list of Google Docs to a specified format. For example, to export a particular folder to PDF you’d type something like this:
googlecl-export -f pdf -d yourfolderofdocs
You need to have GoogleCL installed for the Bash script to work (GoogleCL can be downloaded from http://code.google.com/p/googlecl/) but otherwise you should just need to make the script executable e.g.
chmod u+x googlecl-export and possibly stick it somewhere on your