Forth is a computer programming language based on Reverse Polish Notation (RPN), e.g. in arithmetics like HP calculators:
1 2 + 3 * 4 / ( comments start with open paren and extend to close paren)
compares to Tcl's
[expr {(1+2)*3)/4}] ;# commentsFORTH in tcl anyone?
Chuck Moore created FORTH in 1970. An interesting article about FORTH appeared in Byte magazine [L1 ] .
Related to this is 1% the code a shocking paper by Chuck Moore.
Tutorials
Leo Brodie's "Starting Forth" as a starkit for Windows/Linux/Solaris can be found here [L5 ].
Often over the years, FORTH and Tcl have been compared because of the mindset in both to write lots of procs/words to do one's work.
Several Forths have bound to Tk for their GUI toolkit needs. V6 [L6 ] is a commercial Forth based on Gforth available for Linuxes (and *BSD? and MacOS X?).
Zarutian 24. september 2006: Does an Tcl interpreter in Forth exists?