EnvironmentVariables - Debian Wiki
Environment variables are named strings available to all applications. Variables are used to adapt each application's behavior to the environment it is running in. You might define paths for files, language options, and so on. You can see each application's manual to see what variables are used by that application.
That said, there are several standard variables in Linux environments:
- PATH = Colon separated list of directories to search for commands.
- HOME = Current user's home directory.
- LOGNAME = Current user's name.
- SHELL = The user's preferred shell.
- EDITOR = The user's preferred text editor.
- MAIL = The user's electronic mail inbox location.
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