Shell programming--looping statements

2. Case statement

Only one conditional relationship is judged

Grammar:

Case￠ variable name in

"Value 1")

Procedure 1

;;

"Value 2")

Procedure 2

;;

*)

Procedure 3

;;

Esac

3. For loop

1) Syntax: (Assigning a value to a variable executor, several values are executed several times)

For variable name in value 1 value 2 value 3 ....

Do

Program

Done

2) Syntax: addition with the calculation of the loop control condition is established when the following program is executed (note: Double brackets are used to add and subtract algorithms, double brackets and

There should be a space between the intermediate values)

for (initial value; cyclic control condition; variable change)

Do

Program

Done

4. While loop when conditional judgment is established, execute the following procedure

Grammar:

While [conditional-judging]

Do

Program

Done

4, until cycle when the conditional judgment does not immediately execute the following program

Grammar:

Until [conditional judging type]

Do

Program

Done

Shell programming--looping statements