How to use case statement and Loop statement in shell programming
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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