Unix
Type these commands in a command window:echo $PATH echo $CLASSPATHIf you get a blank command line in response to either of these, then that particular variable has no value (it has not yet been set).
Windows
Type these commands in a command window:echo %PATH% echo %CLASSPATH%If you get the message "echo is on" for either of these, then that particular variable has no value (it has not yet been set).
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