There are two types of environment variables: user environment variables which are for the current user and system environment variables which are available to all users.
The user environment variables are stored in the following registry key:
HKEY_CURRENT_USER\Environment
The System environment variables are stored in the following registry key:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Session Manager\Environment
Open a command prompt, type set, and press Enter to display all current environment variables on your PC.
You can open PowerShell and type Get-ChildItem Env:, and press Enter to display all current environment variables on your PC.
You may have more than this
| Environment Variables | Value |
| %ALLUSERSPROFILE% | C:\ProgramData |
| %APPDATA% | C:\Users\(user)\AppData\Roaming |
| %CD% | (command prompt only) Current directory full path |
| %CMDCMDLINE% | (command prompt only) Returns exact command line used to start current cmd.exe session. |
| %CMDEXTVERSION% | (command prompt only) Number of current command processor extensions. |
| %CommonProgramFiles% | C:\Program Files\Common Files |
| %CommonProgramFiles(x86)% | C:\Program Files (x86)\Common Files |
| %CommonProgramW6432% | C:\Program Files\Common Files |
| %COMPUTERNAME% | The computer name of the current local system. |
| %COMSPEC% | C:\Windows\System32\cmd.exe |
| %DATE% | (command prompt only) Current date in format determined by Date command |
| %DriverData% | C:\Windows\System32\Drivers\DriverData |
| %ERRORLEVEL% | (command prompt only) Number defining exit status of previous command or program |
| %HOMEDRIVE% | C: |
| %HOMEPATH% | \Users\(user) |
| %LOCALAPPDATA% | (user)\AppData\Local |
| %LOGONSERVER% | \\MicrosoftAccount |
| %NUMBER_OF_PROCESSORS% | 12 |
| %OneDrive% | Current OneDrive folder location like C:\Users\user\OneDrive |
| %OS% | Windows_NT |
| %PATH% | C:\WINDOWS C:\WINDOWS\system32 C:\WINDOWS\System32\Wbem C:\WINDOWS\System32\WindowsPowerShell\v1.0 |
| %PATHEXT% | COM;.EXE;.BAT;.CMD;.VBS;.VBE;.JS;.JSE;.WSF;.WSH;.MSC |
| %PROCESSOR_ARCHITECTURE% | AMD64 |
| %PROCESSOR_IDENTIFIER% | AMD64 Family 23 Model 113 Stepping 0, AuthenticAMD |
| %PROCESSOR_LEVEL% | 23 |
| %PROCESSOR_REVISION% | 7100 |
| %ProgramData% | C:\ProgramData |
| %ProgramFiles% | C:\Program Files |
| %ProgramFiles(x86)% | C:\Program Files (x86) |
| %ProgramW6432% | C:\Program Files |
| %PROMPT% | (command prompt only) Code for current command prompt format. Code is usually $P$G |
| %PSModulePath% | C:\Windows\system32\WindowsPowerShell\v1.0\Modules\ |
| %PUBLIC% | C:\Users\Public |
| %RANDOM% | (command prompt only) To get random number between 0 and 32767 |
| %SessionName% | When logging on directly to machine, returns “Console”.
When client connects via terminal server session, is combination of |
| %SystemDrive% | C: |
| %SystemRoot% | C:\Windows |
| %TEMP% | C:\Users\(user)\AppData\Local\Temp |
| %TIME% | (command prompt only) Current time in format determined by Time command |
| %TMP% | C:\Users\(user)\AppData\Local\Temp |
| %USERDOMAIN% | The network domain name associated with the current user. |
| %USERDOMAIN_ROAMINGPROFILE% | The network domain name associated with the current roaming profile. |
| %USERNAME% | (user) |
| %USERPROFILE% | C:\Users\(user) |
| %WINDIR% | C:\Windows |
