>I would like some pointers as to how to install the dbsamples so that I can use them in Postgres. These .tar.qz files seem to contain *.sql files. These seem to be text files but I do not understand how to > import to postgres or if there is some command line command to run.
You can use psql to import .sql files. Once your logged into psql you can \i <filename> to import the files. Have a look at the other options too with \?