Setting or Clearing an Environment Variable in Windows Command Prompt

The following procedures show how to set or clear an environment variable from a command prompt build window or a batch file.

To set an environment variable

• In a command prompt build window or a batch file, type the following command:

  set <environment variable>=<value>

To clear an environment variable

• In a command prompt build window or a batch file, type the following command:

  Note   Ensure that you do not enter a character or space after the equal sign.

  set <environment variable>=

To determine the value of an existing environment variable

• At the command prompt, enter the following command.

  set <environment variable>

  The value for the environment variable is displayed.
  However, if you use only the first few characters in a variable name when entering the set command, this results in the display of values for all environment variables using that prefix.

To append the value of an existing environment variable

• At the command prompt, enter the following command.

  set PATH=%PATH%;<insert your path>