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> I am working on some simple GUI admin tools which use lua-fltk.  
> The following script works in Lua40, but not lua-fltk which is based on
Lua40.  > > Does anybody know of a workaround which will work with lua-fltk?
> ---------
> readfrom("|ls -l")
> d =read("*a")
> print(d)

What is the error?

Did you build your lua-fltk with pipe support?  (See the config file.)