The dd syntax is meant to mirror that of the IBM JCL command dd, and it may have been meant as a joke.
Old versions of sort used a + to begin some options. So yes, there has been a lot of variation over time, but I see no reason to gratuitously diverge from the common standards now in use, unless following them is too restrictive in some way.
Old versions of sort used a + to begin some options. So yes, there has been a lot of variation over time, but I see no reason to gratuitously diverge from the common standards now in use, unless following them is too restrictive in some way.