You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.

231 lines
4.9 KiB

This file contains invisible Unicode characters!

This file contains invisible Unicode characters that may be processed differently from what appears below. If your use case is intentional and legitimate, you can safely ignore this warning. Use the Escape button to reveal hidden characters.

This file contains ambiguous Unicode characters that may be confused with others in your current locale. If your use case is intentional and legitimate, you can safely ignore this warning. Use the Escape button to highlight these characters.

<h1><center>shell函数</center></h1>
作者:行癫(盗版必究)
------
## 一:函数
#### 1.函数介绍
Shell 函数的本质是一段可以重复使用的脚本代码,这段代码被提前编写好了,放在了指定的位置,使用时直接调取即可
#### 2.语法格式
```shell
function name() {
statements
[return value]
}
```
function是 Shell 中的关键字,专门用来定义函数(可以省略)
name是函数名
statements是函数要执行的代码也就是一组命令
return value表示函数的返回值其中 return 是 Shell 关键字,专门用在函数中返回一个值(可以省略)
#### 3.函数定义
```shell
myfunc(){
echo "This is a new function"
}
```
#### 4.函数调用
直接用函数名字调用函数
#### 5.函数传参
```shell
[root@xingdiancloud ~]# cat hello.sh
#!/bin/bash
hello(){
echo $1
}
hello xingdian
[root@xingdiancloud ~]# bash hello.sh
xingdian
```
#### 6.函数变量
```shell
[root@xingdiancloud ~]# cat hello.sh
#!/bin/bash
i=0
echo "$a"
hello(){
a=1
local d=3
echo "$i $a $b $c $d"
}
hello
b=2
echo "$a $d"
[root@xingdiancloud ~]# bash hello.sh
0 1 3
1
```
注意:
默认,函数里的变量会在函数外面生效
注意脚本中内容按上下文顺序执行
local定义的变量只在函数内生效
#### 7.调用函数
创建功能函数
```shell
[root@xingdiancloud ~]# cat hello.sh
#!/bin/bash
hello(){
echo "This is one"
}
```
另一个脚本调用该脚本中函数
```shell
[root@xingdiancloud ~]# cat xingdian.sh
#!/bin/bash
source ./hello.sh
hello
[root@xingdiancloud ~]# bash xingdian.sh
This is one
```
#### 8.函数案例
```shell
#!/bin/bash
#v1.24.5.27.1
#作者:行癫
list()
{
echo "+++++++++++++++++++++++++++++++++"
echo "+++++++ 百宝箱 ++++++++"
echo "+++++++++++++++++++++++++++++++++"
echo "|||||||||||||||||||||||||||||||||"
echo "================================="
echo "= 1.yum仓库初始化 ="
echo "= 2.上课笔记工具安装 ="
echo "= 3.kvm虚拟机安装 ="
echo "= 4.vmware虚拟机安装 ="
echo "= 5.vs code安装 ="
echo "= 6.google浏览器安装 ="
echo "= 7.vnc-server的安装 ="
echo "= 8.一键安装所有 ="
echo "= 9.退出 ="
echo "================================="
}
yum-install(){
echo "====正在执行yum初始化操作请耐心等待===="
rm -rf /etc/yum.repos.d/*
curl -o /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo > /dev/null
yum -y install wget > /dev/null
wget -O /etc/yum.repos.d/epel.repo http://mirrors.aliyun.com/repo/epel-7.repo
echo "====正在清空缓存,请耐心等待!===="
yum clean all
echo "====正在重新加载,请耐心等待!===="
yum makecache
echo "====successed===="
}
cherrytree(){
echo "====正在进行安装......====="
yum -y install cherrytree > /dev/null
if [ $? -eq 0 ];then
echo "====successed===="
else
echo "==== failed ===="
echo "====检查网络和yum仓库===="
exit
fi
}
kvm-install(){
echo "====正在安装kvm虚拟机===="
yum -y install libvirt* virt-manager >> /dev/null && yum -y groupinstall 'Virtualization Host' >> /dev/null
echo "==== successed ===="
}
vmware-install(){
echo "====请将vmware安装包放到当前目录下===="
chmod +x
echo "......."
echo "..........."
echo ".................100%"
}
data=`date | awk '{print $4}'`
read -p "当前时间为${data},你是否要进行电脑初始化,继续请按回车(已记录你的初始时间)"
ping -c1 www.baidu.com 1> /dev/null
if [ $? -eq 0 ];then
echo "网络状况良好,请继续~"
else
echo "网络状况不佳,检查网络~"
exit
fi
echo "xingdian" > user.txt
echo "dianye" > password.txt
read -p "欢迎使用行癫工具箱,进行安装部署操作:"
read -p "请输入用户名:" name
username=`cat user.txt | awk '{print $1}'`
passwd=`cat password.txt | awk '{print $1}'`
if [ "${name}" == "${username}" ];then
read -p "请输入密码:" password
if [ "${password}" == "${passwd}" ];then
echo "登陆成功,进入工具箱"
while :
do
list
read -p "请选择你要使用的工具代码:" num
case $num in
1)
yum-install
sleep 3
;;
2)
cherrytree
sleep 3
;;
3)
;;
4)
;;
9)
break
;;
esac
done
data2=`date | awk '{print $4}'`
echo "结束时间为${data2};感谢您的使用!"
else
echo "用户名密码错误,请重新执行脚本!"
exit
fi
else
echo "用户名输入错误,请重新输入!"
exit
fis
```