Use of Shell functions

Linux scripts are huge and powerful.

Definition:

Function Name () // function can be omitted

{

Command

}

Call: directly use the function name in the script. Of course, you can also include parameters such

Function Name parameters (separated by spaces)

 

Passing parameters to a function: Like using parameters in a general script, the original parameters are returned to the shell script after obtaining parameters using the special variable $1 $2... $9. It can be understood as a C function stack call.

 

Function Exit:

Commonly used exit methods of scripts include exit 0 (normal exit of the table) and Exit 1 (indicating an error exits)

The return 0 and return 1 functions are returned, but the return state is determined by the last instruction of the function.

 

 

Below is a small experiment script written by myself.

#! /Bin/bash

Try ()

{

While [$ #-GT 0]

# Until [$ #-LT 1] // both statements can be used. Note that the test statement is written in [Space]; otherwise, an error occurs.

Do

Echo $1

Shift

Done

}

Try I am a student

Echo $1

The running result is as follows:

ThinkPad @ thinkpad-ThinkPad-R400:/Media/personal/Ubuntu $./fff hello

I

AM

A

Student

Hello

Thinktablet @ thinkpad-ThinkPad-R400:/Media/personal/Ubuntu $