[-x <pattern>|--exclude=<pattern>]
[-X <file>|--exclude-from=<file>]
[--exclude-per-directory=<file>]
+ [--exclude-standard]
[--error-unmatch] [--with-tree=<tree-ish>]
[--full-name] [--abbrev] [--] [<file>]\*
read additional exclude patterns that apply only to the
directory and its subdirectories in <file>.
+--exclude-standard::
+ Add the standard git exclusions: .git/info/exclude, .gitignore
+ in each directory, and the user's global exclusion file.
+
--error-unmatch::
If any <file> does not appear in the index, treat this as an
error (return 1).