Chapter 9. Working with Files and Programs

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	Practical Programming in Tcl & Tk, Third Edition By Brent B. Welch
	Table of Contents
	Part I.  Tcl Basics

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This chapter describes how to run programs, examine the file system, and access environment variables through the env array. Tcl commands described are: exec, file, open, close, read, write, puts, gets, flush, seek, tell, glob, pwd, cd, exit, pid, and registry.

This chapter describes how to run programs and access the file system from Tcl. These commands were designed for UNIX. In Tcl 7.5 they were implemented in the Tcl ports to Windows and Macintosh. There are facilities for naming files and manipulating file names in a platform-independent way, so you can write scripts that are portable across systems. These capabilities enable your Tcl script to be a general-purpose glue that assembles other programs into a tool that is customized for your needs.

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