The two components of the Command Line Interface (CLI) are the Tcl-based programming environment and the commands added to the Tcl interpreter that lets you debug your program. This chapter looks at how these components interact, and describes how you specify processes, groups, and threads.

This chapter emphasizes interactive use of the CLI rather than using the CLI as a programming language because many of its concepts are easier to understand in an interactive framework. However, everything in this chapter can be used in both environments.