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Shell Scripting while loop

Linux scripting while loop is similar to C language while loop. There is a condition in while. And commands are executed till the condition is valid. Once condition becomes false, loop terminates.

Syntax:

Syntax of while loop is shown in the snapshot below,

Example:

We have shown the example of printing number in reverse order.

Output is displayed in the below snapshot,

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while infinite loop:

Infinite loop is also called endless loop. It is made with while true (it means condition will always be true) or while : (it means an empty expression), where colon (:) is equivalent to no operation.

Look at the above snapshot, this script includes while truesyntax.

Look at the above snapshot, this script includes while: syntax.

Both of them display the same output.