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Shell variable Detailed

What is a variable? Why should I use a variable?

The concept of "variable" is used in various shell environments, and shell variables are used to store specific parameters (values) that the system and users need to use, and they can vary according to user settings or system environment changes. By using variables, shell programs can provide more convenient and flexible functionality, more practical and more flexible.

Common types of shell variables include custom variables, environment variables, predefined variables, and positional variables.

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