go into the directory containing code files, execute
./build.sh
executable file a.out
is generated.
./a.out <filename_to_store_the_fs>
For example after building the code if you execute
./a.out s3r.fs
This creates a filesystem in the current folder named "s3r.fs". After executing this command please follow on screen instructions.
For next executions please use the same name("s3r.fs") to use the same filesystem if you want to get the saved contents.