John K. Ousterhout 所著，TCL语言的权威之书。TCL是一门简单实用的语言，比较重要的是目前思科设备可以直接进入TCL调试界面，学好TCL语言，可以大大的帮助网络工程师提高作业效率。-Written by John K. Ousterhout, TCL language of the authority of the book. TCL is a simple and practical language, the more important is the Cisco devices directly into the TCL debugging interface, to learn TCL language can greatly help network engineers improve the operating efficiency.