If you give no parameters on the command line, then fs looks for a configuration file. By default, it looks for a file called fs.cfg in the Fileshare directory, that is, the directory where you started fs. You can use the -cf parameter to specify a different path and/or filename.
For example, you could have a configuration file /home/fsdir/fsconf.cfg containing:
-s server1 -tr f
and start your server server1, from your application command prompt, by entering:
fs -cf fsconf.cfg
Another example is that you could have a configuration file /home/fsdir/fs.cfg containing:
-s server1
and start your server by entering:
fs