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