[Note]shell Basics of function usage

Functions: Naming rules are the same as variables
Executing functions in the current shell process
Modularity of the program for easy maintenance

Basic function Syntax:

        function  function name ()          {             Command Area          }         #注:      The    #     function name can be directly connected to the following parentheses or separated by a space          #     keyword function and () One of the two can be omitted         #      before function calls need to be defined beforehand         #     The return value of the last command in the function represents the end state of the function         #     Execution encounters return immediate End Function call, and return value 0        #     command area use   Return n (0~255)   can specify a return value         #     The function is valid only in a defined shell environment         #     when a parameter is passed to a function, the function name is separated by a space between the arguments          #     variables defined in script are global variables relative to script, affecting their inner function area          #     use positional parameters $n to pass variable values instead of using variables         #      Use the local  variable name = variable value in a function to make the variable internal, without affecting the variable with the same name outside the function

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[Note]shell Basics of function usage