I have started a new thread rather then reviving this one:
Creating your own syntax highlighting in GEdit?
Hope that was the right thing to do. I have created a syntax file for fish shell and placed it in /usr/share/gtksourceview-2.0/language-specs (in Ubuntu). When I open a .fish file with gedit there is no highlighting and the view-->high light mode menu does not show this fish as an option. Is there something that needs to be updated to allow the file to be recognized?
Thanks for reading-Patrick