mkdir yourdir (where yourdir is whatever you want to call it)

tar -xvzf coteutil.tgz

edit the Holidays.ksh and specdays.ksh file and change

MYDIR="/usr/local/bin" to MYDIR="yourdir"

cd to MYDIR

type ./Holidays.ksh &

you'll see what should happen.

add yourdir/Holidays.ksh to the Xquartz menu and then run it from the menu and you'll see what happens.