icalfilter(1) on Linux
The text 25ef91de9e02, as Debian 12 (Bookworm) shipped it.
filter an iCalendar file based on class and/or category
Flags it lists
-
--add-category -
--category -
--class -
--not-category -
--not-class -
-C -
-P -
-c -
-p