I am used to utype `.r' as a shortcut for `.run' in
IDL, but GDL interprets `.r' as `.reset_session'. I am
not sure `.r' is even documented for IDL, I know a
number of people that use it.
While I personally could get into the habit of typing
`.run', this would be an obstacle to coworkers if I try
to convince them that GDL is a drop-in replacement for IDL.