Yeah, but you write those 2 functions once, and use the result combination all the time without separating them. You don't want to write both of them all the ti

Yeah, but you write those 2 functions once, and use the result combination all the time without separating them. You don't want to write both of them all the time, which is what happens on the shell (unless you create an alias, or a program... which is exactly what 'ls' is)