Tcl/Tk 8.5 Programming Cookbook

Command line arguments

With any scripting language, the ability to provide arguments allows you to write a script that accepts arguments to perform a specific function.

As previously discussed, Tcl has several global variables to allow for the passing of command line arguments. The number of command line arguments to a Tcl script is passed as the global variable argc. The name of a Tcl script is passed to the script as the global variable argv0, and the arguments are passed as a list in the argv global variable.

Launching a Tcl script

In the following example we will invoke a Tcl script contained within a text file. This script will accept any number of arguments and print out the script name, the count of the arguments and the values contained ...