convert-ly --from=... --to=... --no-version *.itely
@end example
+To see the changes in the LilyPond syntax between two versions, use
+
+@example
+convert-ly --from=... --to=... -s
+@end example
+
To upgrade many files at once, combine @code{convert-ly} with
standard unix commands. This example will upgrade all @code{.ly}
files in the current directory