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Everything is a command in Tcl

Posted by admin (Graham Ellis), 19 July 2002
If you've programmed in Perl (or Java, or PHP, or .....), there are some suprises in store for you when you first come to Tcl.   All the other languages that I have mentioned are operator based languages, but Tcl is command based.   OK - so much for the statement of theory - what does that mean in practice?

* It means that each statement of your program starts with a command name stating what is to be done, just as you would do to the DOS prompt or to a Unix or Linux shell prompt.

* It means that each statement will end at the end of the line unless you use some form of explicit continuation character to write a multiline statement

* It means that spaces are necessary between elements of your statement, and that leaving out a space can have a major effect on your code.

Although you may find this strange and difficult when you first come to Tcl, with a little experience it turns out to be no great problem, and with the wide range of built in commands in Tcl, together with your own commands added via libraries and/or procs it proves to be a very powerful language.



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