There are some. For example BSD ls(1) is not able to list dirs first. Other thing is that BSD utils are more strict ... like: # command -o -p -t -i -O -n

There are some. For example BSD ls(1) is not able to list dirs first. Other thing is that BSD utils are more strict ... like: # command -o -p -t -i -O -n -s ARGUMENTS If you do it other wise - like that: # command -o -p -t ARGUMENTS -i -O -n -s ... they will just throw error - but its all documented in the man pages.