{"id":1071,"date":"2021-06-15T09:44:32","date_gmt":"2021-06-15T01:44:32","guid":{"rendered":"https:\/\/wp.vicds.com\/?p=1071"},"modified":"2021-06-15T09:44:32","modified_gmt":"2021-06-15T01:44:32","slug":"%e5%be%ae%e8%bb%9f%e7%9a%84%ef%bc%85%ef%bc%85%e8%b7%af%e5%be%91","status":"publish","type":"post","link":"https:\/\/wp.vicds.com\/?p=1071","title":{"rendered":"\u5fae\u8edf\u7684\uff05\uff05\u8def\u5f91"},"content":{"rendered":"\n

\u53c3\u8003\u81ea https:\/\/ss64.com\/nt\/syntax-variables.html<\/a><\/p>\n\n\n\n

Standard (built-in) Environment Variables<\/h2>\n\n\n\n
Variable<\/th>Volatile
(Read-Only)<\/th>		Default value assuming the system drive is C:<\/th><\/tr>
ALLUSERSPROFILE<\/td> <\/td>C:\\ProgramData<\/td><\/tr>
APPDATA<\/td> <\/td>C:\\Users\\{username}<\/em>\\AppData\\Roaming<\/td><\/tr>
CD<\/td>Y<\/td>The current directory (string).<\/td><\/tr>
ClientName<\/td>Y<\/td>Terminal servers only – the ComputerName of a remote host.<\/td><\/tr>
CMDEXTVERSION<\/td>Y<\/td>The current Command Processor Extensions version number. (NT = “1”, Win2000+ = “2”.)<\/td><\/tr>
CMDCMDLINE<\/td>Y<\/td>The original command line that invoked the Command Processor<\/a>.<\/td><\/tr>
CommonProgramFiles<\/td> <\/td>C:\\Program Files\\Common Files<\/td><\/tr>
COMMONPROGRAMFILES(x86)<\/td> <\/td>C:\\Program Files (x86)\\Common Files<\/td><\/tr>
COMPUTERNAME<\/td> <\/td>{computername}<\/em><\/td><\/tr>
COMSPEC<\/td> <\/td>C:\\Windows\\System32\\cmd.exe or if running a 32 bit WOW<\/a> – C:\\Windows\\SysWOW64\\cmd.exe<\/td><\/tr>
DATE<\/td>Y<\/td>The current date using same region specific format as DATE<\/a>.<\/td><\/tr>
ERRORLEVEL<\/td>Y<\/td>The current ERRORLEVEL value, automatically set when a program exits.<\/td><\/tr>
FPS_BROWSER_APP_PROFILE_STRING
FPS_BROWSER_USER_PROFILE_STRING
<\/td>		 <\/td>Internet Explorer
Default
These are undocumented variables for the Edge browser in Windows 10.<\/td><\/tr>
HighestNumaNodeNumber<\/td>Y (hidden)<\/td>The highest NUMA<\/a> node number on this computer.<\/td><\/tr>
HOMEDRIVE<\/td>Y<\/td>C:<\/td><\/tr>
HOMEPATH<\/td>Y<\/td>\\Users\\{username}<\/em><\/td><\/tr>
LOCALAPPDATA<\/td> <\/td>C:\\Users\\{username}<\/em>\\AppData\\Local<\/td><\/tr>
LOGONSERVER<\/td> <\/td>\\\\{domain_logon_server}<\/td><\/tr>
NUMBER_OF_PROCESSORS<\/td>Y<\/td>The Number of processors running on the machine.<\/td><\/tr>
OS<\/td>Y<\/td>Operating system on the user’s workstation.<\/td><\/tr>
PATH<\/a><\/td>User and
System<\/td>		C:\\Windows\\System32\\;C:\\Windows\\;C:\\Windows\\System32\\Wbem;{plus program paths}<\/em><\/td><\/tr>
PATHEXT<\/td><\/td>.COM; .EXE; .BAT; .CMD; .VBS; .VBE; .JS ; .WSF; .WSH; .MSC
Determine the default executable file extensions to search for and use, and in which order, left to right.
The syntax is like the PATH variable – semicolon separators.<\/td><\/tr>
PROCESSOR_ARCHITECTURE<\/td>Y<\/td>AMD64\/IA64\/x86 This doesn’t tell you the architecture of the processor but only of the current process, so it returns “x86” for a 32 bit WOW<\/a> process running on 64 bit Windows. See detecting OS 32\/64 bit<\/a><\/td><\/tr>
PROCESSOR_ARCHITEW6432<\/td> <\/td>=%PROCESSOR_ARCHITECTURE% (but only available to 64 bit processes)<\/td><\/tr>
PROCESSOR_IDENTIFIER<\/td>Y<\/td>Processor ID of the user’s workstation.<\/td><\/tr>
PROCESSOR_LEVEL<\/td>Y<\/td>Processor level of the user’s workstation.<\/td><\/tr>
PROCESSOR_REVISION<\/td>Y<\/td>Processor version of the user’s workstation.<\/td><\/tr>
ProgramW6432<\/td> <\/td>=%ProgramFiles%(but only available when running under a 64 bit OS)<\/td><\/tr>
ProgramData<\/td> <\/td>C:\\ProgramData<\/td><\/tr>
ProgramFiles<\/td> <\/td>C:\\Program Files or C:\\Program Files (x86)<\/a><\/td><\/tr>
ProgramFiles(x86) 1<\/sup><\/td> <\/td>C:\\Program Files (x86)   (but only available when running under a 64 bit OS)<\/td><\/tr>
PROMPT<\/td> <\/td>Code for current command prompt<\/a> format,usually $P$G
C:><\/td><\/tr>
PSModulePath<\/td> <\/td>%SystemRoot%\\system32\\WindowsPowerShell\\v1.0\\Modules\\<\/td><\/tr>
Public<\/td> <\/td>C:\\Users\\Public<\/td><\/tr>
RANDOM<\/a><\/td>Y<\/td>A random integer number, anything from 0 to 32,767 (inclusive).<\/td><\/tr>
%SessionName%<\/td> <\/td>Terminal servers only – for a terminal server session, SessionName is a combination of the connection name, followed by #SessionNumber<\/em>. For a console session, SessionName returns “Console”.<\/td><\/tr>
SYSTEMDRIVE<\/td> <\/td>C:<\/td><\/tr>
SYSTEMROOT<\/td> <\/td>By default, Windows is installed to C:\\Windows but there’s no guarantee of that, Windows can be installed to a different folder, or a different drive letter.
systemroot is a read-only system variable that will resolve to the correct location.
Defaults in early Windows versions are C:\\WINNT, C:\\WINNT35 and C:\\WTSRV<\/td><\/tr>
TEMP and TMP<\/a><\/td>User Variable<\/td>C:\\Users\\{Username}<\/em>\\AppData\\Local\\Temp
Under XP this was \\{username}<\/em>\\Local Settings<\/strong>\\Temp<\/td><\/tr>
TIME<\/td>Y<\/td>The current time using same format as TIME<\/a>.<\/td><\/tr>
UserDnsDomain<\/a><\/td>Y
User Variable<\/td>		Set if a user is a logged on to a domain and returns the fully qualified DNS domain that the currently logged on user’s account belongs to.<\/td><\/tr>
USERDOMAIN<\/td> <\/td>{userdomain}<\/td><\/tr>
USERDOMAIN_roamingprofile<\/td> <\/td>The user domain for RDS or standard roaming profile paths. Windows 8\/10\/2012 (or Windows 7\/2008 with Q2664408<\/a>)<\/td><\/tr>
USERNAME<\/td> <\/td>{username}<\/em><\/td><\/tr>
USERPROFILE<\/td> <\/td>%SystemDrive%\\Users\\{username}<\/em>
This is equivalent to the $HOME environment variable in Unix\/Linux<\/td><\/tr>
WINDIR<\/td> <\/td>%windir% is a regular User variable and can be changed, which makes it less robust than %SystemRoot%
Set by default as windir=%SystemRoot%
%WinDir% pre-dates Windows NT, its use in many places has been replaced by the system variable: %SystemRoot%<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

1<\/sup> Only on 64 bit systems<\/a>, is used to store 32 bit programs.<\/p>\n\n\n\n

Unless stated otherwise, all the variables above are System variables<\/p>\n\n\n\n

Environment variables are stored in the registry:<\/p>\n\n\n\n

User Variables: HKEY_CURRENT_USER\\Environment
System Variables: HKEY_LOCAL_MACHINE\\SYSTEM\\CurrentControlSet\\Control\\Session Manager\\Environment<\/p>\n\n\n\n

By default, files stored under Local Settings <\/strong>do not roam with a roaming profile.<\/p>\n\n\n\n

Dynamic environment variables are read-only and are computed each time the variable is expanded. When all variables are listed with SET, these will not appear in the list. Do not attempt to directly SET a dynamic variable. <\/p>\n\n\n\n

Shell variables<\/h2>\n\n\n\n

Variables for current shell session are created with the SET<\/a> command and are available only to the current CMD shell. These are only stored in memory not the registry. Shell variables are destroyed when the current shell (CMD) exits.<\/p>

Running the SET command with no options will display all shell variables but also all User and System environment variables.<\/p>

If the SET command is used to modify the PATH<\/a>, or if it is removed completely with PATH ; that will not affect any other programs or CMD sessions opened before or after the current one.<\/p><\/blockquote>\n\n\n","protected":false},"excerpt":{"rendered":"

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