I created a text file with a specific extension:
It displays in finder link this:
and BASH like this:
-rw-r--r--@ 1 raven staff 1903 Feb 19 10:31 Vendor_0408_Product_3008.idc.rtf
with a .rtf extension. In Finder, I went to preferences/advanced and made sure that "Show all filename extensions" is checked:
But it still does not display the extension?!