working with several files in a bigger project makes it sometimes difficult to search and replace strings for all these files. with the following perl-command (perl must be installed ;-) it's possible:
perl -e 's/Berlin City/Tokyo Metropolitan/gi' -p -i.bak *.lyxchanges in all files with suffix lyx in the actual directory the word "Berlin City" to "Tokyo Metropolitan" and (!) copy the old files to *.bak, which could be sometimes important ;-)