uuid, _core (default_config_hash)

Option to remove all of the UUIDs and _core (default_config_hash) from your config files so that they don't conflict with those of new sites:

find /path/to/PROFILE_NAME/config/install/ -type f -exec sed -i -e '/^uuid: /d' {} \;
find /path/to/PROFILE_NAME/config/install/ -type f -exec sed -i -e '/_core:/,+1d' {} \;

In case you are on Mac OSX, the '-e' flag won't work. It duplicates the files and appends '-e' to the file (i.e. file-name.yml-e). The ",+1d" also will not work on Mac OSX:

find /path/to/PROFILE_NAME/config/install/ -type f -exec sed -i '' '/^uuid: /d' {} \;
find /path/to/PROFILE_NAME/config/install/ -type f -exec sed -i '' '/_core:/{N;d;}' {} \;