if your unix box can write the collected data to a database like mysql, sqlserver, oracle, then you can define a odbc connection that filemaker can use as external data source. And then filemaker can do anything with it.
greetings from germany
If you don't want to keep the "ancient unix box" and would like to do everything in Filemaker, see if you can get the data exported from its current tables as tab or csv files. Then you can import the data into tables in filemaker and can manage the entire system that way. (This approach can be a lot simpler for many situations.)