C.1.4 Excluding directories
An alias module may exclude particular directories from
other modules by using an exclamation mark (`!')
before the name of each directory to be excluded.
For example, if the modules file contains:
| exmodule -a !first-dir/sdir first-dir
|
then checking out the module `exmodule' will check
out everything in `first-dir' except any files in
the subdirectory `first-dir/sdir'.