windows 内建环境变量

 PS C:\Windows> ls env:

 Name                           Value
 ----                           -----
 _NT_SYMBOL_PATH                srv*C:\Users\vv\Documents\symbols
 ALLUSERSPROFILE                C:\ProgramData
 APPDATA                        C:\Users\vv\AppData\Roaming
 CommonProgramFiles             C:\Program Files\Common Files
 CommonProgramFiles(x86)        C:\Program Files (x86)\Common Files
 CommonProgramW6432             C:\Program Files\Common Files
 COMPUTERNAME                   VV6B40
 ComSpec                        C:\Windows\system32\cmd.exe
 FP_NO_HOST_CHECK               NO
 HOMEDRIVE                      C:
 HOMEPATH                       \Users\vv
 LOCALAPPDATA                   C:\Users\vv\AppData\Local
 LOGONSERVER                    \\VV6B40
 MOZ_PLUGIN_PATH                C:\Program Files (x86)\Foxit Software\Foxit Reader\plugins\
 NUMBER_OF_PROCESSORS           6
 OS                             Windows_NT
 Path                           %SystemRoot%\system32\WindowsPowerShell\v1.0\;C:\Program Files (x86)\Parallels\Parall..
 PATHEXT                        .COM;.EXE;.BAT;.CMD;.VBS;.VBE;.JS;.JSE;.WSF;.WSH;.MSC;.CPL
 PROCESSOR_ARCHITECTURE         AMD64
 PROCESSOR_IDENTIFIER           Intel64 Family 6 Model 158 Stepping 9, GenuineIntel
 PROCESSOR_LEVEL                6
 PROCESSOR_REVISION             9e09
 ProgramData                    C:\ProgramData
 ProgramFiles                   C:\Program Files
 ProgramFiles(x86)              C:\Program Files (x86)
 ProgramW6432                   C:\Program Files
 PSModulePath                   C:\Users\vv\Documents\WindowsPowerShell\Modules;C:\Program Files\WindowsPowerShell\Mo..
 PUBLIC                         C:\Users\Public
 SESSIONNAME                    Console
 SystemDrive                    C:
 SystemRoot                     C:\Windows
 TEMP                           C:\Users\vv\AppData\Local\Temp
 TMP                            C:\Users\vv\AppData\Local\Temp
 USERDOMAIN                     VV6B40
 USERNAME                       vv
 USERPROFILE                    C:\Users\vv
 VS110COMNTOOLS                 C:\Program Files (x86)\Microsoft Visual Studio 11.0\Common7\Tools\
 VS120COMNTOOLS                 C:\Program Files (x86)\Microsoft Visual Studio 12.0\Common7\Tools\
 windir                         C:\Windows
 windows_tracing_flags          3
 windows_tracing_logfile        C:\BVTBin\Tests\installpackage\csilogfile.log