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Environment variable generally refers to some parameters used in the operating system to specify the running environment of system and software, such as: temporary folder location, and system folder path. Modifying environment variables is a common thing for both programmers and system administrators. But the Windows’ built-in environment variable editor is notoriously unfriendly (for example, the value of “Path” variable is not only displayed on a single line, but also separated by commas, which is very easy to be missed out and cause unnecessary trouble).