To use the script, run it from the commandline like so.

.\ReloadTermSets.ps1 -web “http://localhost” -test -recurse

web – This is the web address to use.
test – This uses a ‘test’ mode that will output lines detailing found fields and the values found for them in the term store and won’t save the items.
recurse – This flag will cause the script to recurse through all child sites.