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List of Environment Variables in Windows Operating System.

List of Environment Variables in Windows Operating System

Windows XP Environment Variables

Environment Variable Path
%ALLUSERSPROFILE% C:\Documents and Settings\All Users
%APPDATA% C:\Documents and Settings{username}\Application Data
%COMMONPROGRAMFILES% C:\Program Files\Common Files
%COMMONPROGRAMFILES(x86)% C:\Program Files (x86)\Common Files
%COMSPEC% C:\Windows\System32\cmd.exe
%HOMEDRIVE% C:
%HOMEPATH% C:\Documents and Settings{username}
%PROGRAMFILES% C:\Program Files
%PROGRAMFILES(X86)% C:\Program Files (x86) (only in 64-bit version)
%SystemDrive% C:
%SystemRoot% C:\Windows
%TEMP% and %TMP% C:\Documents and Settings{username}\Local Settings\Temp
%USERPROFILE% C:\Documents and Settings{username}
%WINDIR% C:\Windows

Windows Vista and Later

Environment Variable Path
%ALLUSERSPROFILE% C:\ProgramData
%APPDATA% C:\Users{username}\AppData\Roaming
%COMMONPROGRAMFILES% C:\Program Files\Common Files
%COMMONPROGRAMFILES(x86)% C:\Program Files (x86)\Common Files
%COMSPEC% C:\Windows\System32\cmd.exe
%HOMEDRIVE% C:
%HOMEPATH% C:\Users{username}
%LOCALAPPDATA% C:\Users{username}\AppData\Local
%PROGRAMDATA% C:\ProgramData
%PROGRAMFILES% C:\Program Files
%PROGRAMFILES(X86)% C:\Program Files (x86) (only in 64-bit version)
%PUBLIC% C:\Users\Public
%SystemDrive% C:
%SystemRoot% C:\Windows
%TEMP% and %TMP% C:\Users{username}\AppData\Local\Temp
%USERPROFILE% C:\Users{username}
%WINDIR% C:\Windows
%SystemDirectory% C:\WINDOWS\System32

More

Environment Variable Detail
%CD% The current directory.
%ERRORLEVEL% A number defining exit status of a previous command or called executable.
%OS% The operating system the user is running
%USERDOMAIN% The name of the domain that contains the user's account
%USERNAME% The user's name
%DATE% Current date in the format
%TIME% Current time in the format
%RANDOM% A random number between 0 and 32767.
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