Tcl

Hello World in Tcl

Every programming journey starts with Hello World. Tcl makes this remarkably simple—reflecting its design philosophy that scripting should be easy and intuitive.

The Code

Create a file named hello.tcl …

Variables and Types in Tcl

Tcl’s approach to variables is unlike almost any other mainstream language. Rooted in the design philosophy that everything is a string, Tcl has no type declarations, no type keywords, and no …

Operators in Tcl

In most languages, 2 + 2 is an expression the parser understands directly. Tcl is different. Because everything is a command and everything is a string, Tcl has no built-in arithmetic in its core …

Control Flow in Tcl

Control flow determines the order in which your program executes. Tcl approaches control flow in a way that surprises newcomers: there are no special control-flow keywords. Instead, if, while, for, …