Windows Environment Variable

In Windows, the environment variables are placed between the “%” character. Thus to display the value of an environment variable, simply type following type of command:

echo %NAME_OF_THE_VARIABLE%
Here is a non-exhaustive list of the main environment variables on Windows systems:

Environment variable Description
%APPDATA% Returns an access path to the default directory containing the user programmes (by default: C:Program Files.
%CMDCMDLINE% Returns the exact command used to access the command interpreter (cmd.exe).
%COMPUTERNAME% Returns the name attributed to the computer.
%DATE% Returns the day’s date.
%ERRORLEVEL% Contains the error code of the latest command used.
%HOMEDRIVE% Contains the letter of the drive on which the current user’s directory is located.
%HOMEDRIVE% Contains the letter of the drive on which the current user’s directory is located.
%HOMEPATH% Contains the full access path to the current user’s directory.
%NUMBER_OF_PROCESSOR% Contains the number of processors present on the system.
%OS% Contains a chain of characters describing the operating system installed. Note that Windows 2000 is identified as WINDOWS_NT.
%PATH% Specifies the access path to the system’s main executables.
%PATHEXT% Describes the extensions that the system considers to be executable.
%PROCESSOR_ARCHITECTURE% Describes the architecture of the processor (x86/x64 for Intel machines, IA64 for RISC architectures).
%RANDOM% Returns an integer between 0 and 32167 chosen at random by the system.
%SYSTEMDRIVE% Contains the letter of the drive on which the system is located (generally C:).
%SYSTEMROOT% Contains the access path to the system’s root directory.
%TEMP% Contains the temporary directory access path for the applications.
%TMP% Contains the temporary directory access path for the applications.
%TIME% Returns the day’s date.
%USERDOMAIN% Contains the domain to which the current account belongs.
%USERNAME% Contains the user name corresponding to the current account.
%USERPROFILE% Contains the location of the current account user profile.
%WINDIR% Contains the access path to the system’s directory (generally C:WINDOWS or C:WINNT).

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