Linux commands (11)--shell Programming II (Circular control statements)

1.if statements

(1) If statement of two-way branch

(2) If statement of the multi-path conditional Judgment Branch

2. Test statements

(1) file test

(2) String test

(3) Numerical test

(4) Test statements combined with logical operators

3.case statements

4.for Loop statement

(1) [argument-list] is a variable value table

(2) [Argument-list] is a file expression

(3) [Argument-list] is empty

5.while statements

6.until statements

7.break and Continue statements

(1) Break statement

(2) Continue statement

8. Arithmetic expressions and Exit script commands

(1) Arithmetic expressions

(2) Exit script command

9. Custom Functions

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Linux commands (11)--shell Programming II (Circular control statements)