You can view the present working directory that you are in by using the pwd command. In order to change directory, you can use the cd command. In the Unix environment, directories are separated by a "/", such as "soar-tutorial/ht.s7". On the Macintosh, separation is done by a ":", such as "soar-tutorial:ht.s7".
Files can be loaded by using the source command. For example, source ht.s7 will load the first hungry-thirsty program into Soar, assuming it exists in the present working directory.