注意：如下图，在命令行中直接输入的四行路径不能被保存到文件中。 export NS_HOME=`pwd`/ns-allinone-2.28 export PATH=$NS_HOME/tcl8.4.5/unix:$NS_HOME/tk8.4.5/unix:$NS_HOME/bin:$PATH export LD_LIBRARY_PATH=$NS_HOME/tcl8.4.5/unix:$NS_HOME/tk8.4.5/unix:$NS_HOME/otcl-1.9:$NS_HOME/lib

tk是一个结合tcl语言开发图形图像的脚本，如风河的Tornado就是用tcl＋tk开发的IDE。-tk is a combination of language development tcl scr ipt graphic images, such as wind River Tornado is to use tcl tk development IDE.

tk dierctory for for NS 2 sooftware

linux 下通用的脚本编程环境，使用和安装方便，资源消耗很小-linux under common scr ipting environment to use and easy to install, the resource consumption is small