I'm not sure of a command line utility, but you can easily do this with a script in Python and python-compizconfig package. Here you go:

#!/usr/bin/python

import sys, os

import compizconfig



#The last input on the command line will be the path to save the file to.

savefile=sys.argv[-1]



context=compizconfig.Context()

#Change keyword if you want to skip saving entries that are default

context.Export(os.path.abspath(savefile),skipDefaults=False)

To import settings, you could just change the last line to context.Import(os.path.abspath(savefile))

Now to run, just save and chmod +x scriptname.py and run ./scriptname.py FILE or run with python scriptname.py FILE if you don't chmod.

WARNING- I have only tested a bit and basic functionality works, but I guarantee nothing. The script can be made much more robust and functional.