Common keywords not highlighted in Shell language

In using the Shell language (bash and others though we use Korn mainly, I have found several common UNIX commands that aren't highlighted via syntax highlighting. I'm sure there are more, but those I noticed are:

ls

cat

touch

cut

tail

head

mail

print

grep

cp

mv

rm

mkdir

rmdir

chmod

function

whence

One way to verify more of them would be to look at the Notepad++ free editor, which has that language and the keywords could be pulled from its lists.