>My question is how would you accomplish the same task in POSIX?
>How could you feed default parms into ls -l, call the file /bin/lf
>and have it work the same?

Lotsa ways ... after all, it's POSIX. :-)

Try this for one:

alias -x ls="ls -l"

You can put that in your .profile and whenever you use "ls",
you'll get "ls -l". All parms that you specify will be
automatically included.