Mac OS X 10.7 (released in 2011) deprecated the command line syntax to access file resource fork.
Before, you do ls -l filename/rsrc but that no longer works.
The new syntax is ls -l filename/..namedfork/rsrc.
ls -l filename/rsrc
ls -l filename/..namedfork/rsrc
see Mac OS X Resource Fork and Command Line Tips
thanks to Marius Piedallu van Wyk