In this lesson, we will delve into an essential aspect of shell scripting — Control Structures and Logical Operators. Control structures such as if, elif, and else allow you to make decisions within your scripts, enabling them to respond intelligently based on different conditions. Additionally, logical operators like && (AND) and || (OR) help you combine multiple conditions to create more complex logic.

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The if/elif/else control structure allows you to perform different actions based on various conditions. Here’s the syntax:

Each condition must be enclosed in []. After the condition, the then keyword specifies the code to execute if the condition evaluates to 0 (true).

All control structures must start with an statement. The and statements are optional. Each condition is checked until one of the conditions evaluates to true. If none of the or conditions are true, the statement is executed.