Request: List the environment variables from Command Promt
To list one varibales , the syntax is like :
echo %path%
To list all variables in command prompt. you can use :
set
e.g:
C:\Users\tcaiy\set
you can also sent the output to a output file , which you can open it via notepad or whatever...
List environment variables from Command Prompt
原文：http://www.cnblogs.com/weeky/p/3526825.html