查看环境变量

 (gc env:path).split(";")

 (type env:path) -split ';'

 ls env:

$env:computername

$env:userprofile

 结果：

C:Python27
C:Program FilesInteliCLS Client
C:Windowssystem32
C:Windows
C:WindowsSystem32Wbem
C:WindowsSystem32WindowsPowerShellv1.0
C:Program FilesIntelIntel(R) Management Engine ComponentsDAL
C:Program FilesIntelIntel(R) Management Engine ComponentsIPT
C:Program FilesIntelOpenCL SDK2.0inx86
C:Program FilesOpenVPNin

%USERNAME% - 当前用户名

%USERPROFILE% - 当前用户主目录

批处理中的环境变量：http://www.cnblogs.com/dreamer-fish/p/4056627.html