Exploring Environment and Shell Variables
Learn the basics of the environment and shell variables.
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The two types of variables are environment variables and shell variables. Environment variables are defined in the current shell session and are available to any programs executed. Environment variables often control how programs work. For example, we might set a LANG environment variable that other programs can use to determine the language a program should use to communicate with us. Shell variables are similar, except they’re not available to programs and subprocesses. We can think of environment variables as global variables and shell variables as local ones.