1、

root@PC1:/home/test# ls
test.sh
root@PC1:/home/test# cat test.sh
#!/bin/bash
#using a function in a script

function func1 {                                     ## shell自定义函数的格式之一是 function + 函数名 {command}
        echo "this is an example of a function"
        }

for ((i = 1; i <= 5; i++))
do
func1                                  ## 利用for循环连续调用函数5次
done　　　　　　　　　　　　　　　　　　　　　## 定义函数的目的是实现代码的复用，避免重复写command

 

root@PC1:/home/test# ls
test.sh
root@PC1:/home/test# cat test.sh
#!/bin/bash
#using a function in a script

function func1 {
        echo "this is an example of a function"
        }

for ((i = 1; i <= 5; i++))
do
func1
done
root@PC1:/home/test# bash test.sh   ## 执行效果
this is an example of a function
this is an example of a function
this is an example of a function
this is an example of a function
this is an example of a function