Keyboard Maestro Wiki

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The Environment Variable condition looks at the system environment variables that make up Keyboard Maestro Engine's environment and determines if the specified environment variable:

• exists.
• does not exist.
• is empty.
• is not empty.
• is exactly a specified string.
• is not exactly a specified string.
• contains (case insensitively) a specified string.
• does not contain (case insensitively) a specified string.
• matches a specified regular expression.
• does not match a specified regular expression.

See also these forum topics:

Why isn't $KMVAR variable displayed in terminal with an echo command?