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This article mainly introduces how to use case statements and loop statements in shell programming, which has a certain reference value, interested friends can refer to, I hope you can learn a lot after reading this article, let the editor take you to understand it.

Case statement

The syntax structure is as follows

Case variable value in

Mode 1)

Command sequence 1

Mode 2)

Command sequence 2

.

*)

Default command sequence

Esac

For loop statement

There are two types of for loop statements

Specify the number of cycles

Ergodic loop

The traversal loop format is as follows

For variable name in value list

Do

Command sequence

Done

Specify the number of cycles

Ergodic loop

While loop statement

Whlie

Do

Command sequence

Done

The following program creates five users starting with atu with a password of 123.

Until loop statement

The until loop statement is similar to while, except that when the condition is not true, execute the civil command sequence.

Application of shell function

The shell function can be written together in a command sequence format so that it can be reused.

[function] function name () {

Command sequence

[return x]

}

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