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This article focuses on "what are the shell script functions", interested friends may wish to have a look. The method introduced in this paper is simple, fast and practical. Let's let the editor take you to learn what are the shell script functions.

1 define function

Function fname () {

Statements; # inside the function

}

Or

Fname () {

Inside the statements;# function

}

2 call

$fname;# executes function

$fname arg1 arg2; # pass parameters

3 Parameter acquisition:

$1 first parameter $2 second parameter. Nth parameter of $n

$@ can represent "$1", "$2", "$3", etc., often representing parameters separated by spaces

$* can stand for "$1c$2c$3" where c is a character and treats all parameters as a single string, rarely applicable.

4 apply the function to the child shell: export-f fname

5 get the function return value: echo $?; # returns 0 indicates success. Non-zero is a failure.

6 date date command

Date-s "format date string"

Date "+% Y% B% d"; # print the corresponding format date: 2012 August 02

7 read read command

Read-n 2 var; # reads 2 characters and stores them in the var variable.

Read-s var; # does not echo what is read

Read-p "Engter input:" var; # displays prompt messages

Read-t 3 var; # reads for the variable var in 3 seconds.

Read-d ":" var # ends the input line with a delimiter.

At this point, I believe you have a deeper understanding of "what are the shell script functions?" you might as well do it in practice. Here is the website, more related content can enter the relevant channels to inquire, follow us, continue to learn!

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