How shell uses functions

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Function

Variables defined anywhere are global variables. If you want to define local variables, you need to add the local keyword

Functions in shell can also use recursion

#! / bin/bash function factorial {if [[$1-eq 1]]; then echo 1 else local temp=$ [$1-1] local result= `factorial $temp`echo $[$result * $1] fi} result= `factorial 5` echo $result

Create a function library

Set a function in another file, and then load it into the current file through the source command

Use functions in the exercise of commands

Define the function in ~ / .bashrc

Pass an array to a function

#! / bin/bash # adding values in an array function addarray {local sum=0 local newarray newarray= (`newarray "$@" `) for value in ${newarray [*]} do sum=$ [$sum+$value] done echo $sum} myarray= (12345) echo "The original array is: ${myarray [*]}" arg1= `echo ${myarray [*]} `result= `array $arg1`echo "The result is $result" Thank you for reading! This is the end of this article on "how to use functions in shell". I hope the above content can be of some help to you, so that you can learn more knowledge. if you think the article is good, you can share it out for more people to see!