To unset an environment variable, use " set varname=", i.e., set it to an empty string. There shall be no spaces before and after the '=' sign. To set (or change) a environment variable, use command " set varname= value".
To display a particular variable, use command " set varname", or " echo % varname%": // Display a particular variable set COMPUTERNAME COMPUTERNAME=xxxxxx // or, use "echo" command with variable name enclosed within a pair of '%' echo %COMPUTERNAME% COMPUTERNAME=xxxxxx Set/Unset/Change an Environment Variable for the "Current" CMD Session Pay particular attention to the variable called PATH. Try issuing a " set" command on your system, and study the environment variables listed. To list ALL the environment variables and their values, start a CMD and issue the command " set", as follows, // Display all the variables (in NAME=VALUE pairs) set COMPUTERNAME=xxxxxxx Display Environment Variables and their Values They are typically named in uppercase, with words joined with underscore ( _), e.g., JAVA_HOME.
#Set environment variable mac for java windows
(Windows) HOMEDRIVE, HOMEPATH: Current user's home directory.Įnvironment Variables in Windows are NOT case-sensitive (because the legacy DOS is NOT case-sensitive).COMPUTENAME, USERNAME: stores the computer and current user name.PATH: the most frequently-used environment variable, which stores a list of directories to search for executable programs.Environment variables are useful to store system-wide values, for examples, Environment variables are global system variables accessible by all the processes/users running under the Operating System (OS), such as Windows, macOS and Linux.
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