Django import settings

SCRATCH is an example of an environment variable . When used as part of a command they need to be preceded by a ‘$’, hence ‘$SCRATCH’. They are called environment variables because they are used to modify the environment in which some programs run on the central system.

Environment variables is the set of key-value pairs for the current user environment . They are generally set by the operating system and the current user-specific configurations. For example, in a Unix environment, the environment variables are set using the user profile i.e. .

An environment variable is a dynamic-named value that can affect the way running processes will behave on a computer . They are part of the environment in which a process runs.

Environment variables live in the memory , not on the disk. People usually save environment variables in files only for not having to do the same exporting of them by hand repetitively.