Dear Houdini

If you made simlink when you installed Houdini, you can simplify directory path to jump to:

if (($1 == 16)); then
	cd /opt/hfs16.0
elif (($1 == 17)); then
	cd /opt/hfs17.0
fi

Unlike alias, a function can take arguments.

H()
{
	if (($1 == 16)); then
		cd /opt/hfs16.5
	elif (($1 == 17)); then
		cd /opt/hfs17.0
	fi
	source houdini_setup
	houdinifx
}

Write above to a bash file read on start-up.
Then, type

H 16

or

H 17