Tool Command Language: 4.5 Syntax and Structure: Procedures

Tcl allows one to extend the command interface by defining procedures. A Tcl procedure can be invoked just like any other Tcl command (it has a name and it receives one or more arguments). The only difference is that its body is not a piece of C code linked into the program; it is a string containing one or more other Tcl commands. See the proc command for information on how to define procedures and what happens when they are invoked.

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4.6 Variables