This is a simple interpreter executing FlagShip (xBase) based statements.
It accepts standard commands and functions available in the FS library,
as well as assign and access of given variables. 

This “fsi“ is not intended to replace the FlagShip compiler. Instead, 
it allows you a quick on-line checking the intended syntax in your 
application, maintain databases etc. in a similar way as for example 
the dBase, FoxPro or similar interpreters do.

The given syntax will be tested by the FlagShip Preprocessor and
translated according to the /usr/include/std.fh file. The FS Compiler
will (and cannot) be invoked here, so the given statements will be
macro-evaluated (some says macro-compiled) by the FS run time system 
instead. Installed FlagShip is required when fsi is running.

Read additional info and hints in the header of fsi.prg  
There is an extensive on-line help available, type HELP when running