（7）case语句

(1)case 语法

case "变量" in

模式1) 命令序列1 ;;

模式2)	命令序列2 ;;

模式3)	命令序列3 ;;

*)	无匹配后命令序列

esac

(2)多系统配置yum源

#!/bin/bash

cat << EOF

1.install Centos5 yum repo

2.install Centos6 yum repo

3.install Centos7 yum repo

EOF

clear_cache() {

	yum clean all

    yum makecache

}

[ -d /etc/yum.repos.d/bak/ ] || mkdir /etc/yum.repos.d/bak

mv /etc/yum.repos.d/*.repo /etc/yum.repos.d/bak/ &>/dev/null

read -p "please input a number ,eg 1|2|3 ...." num

case "$num" in

        1)

        wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-5.repo

		clear_cache

        ;;

        2)

        wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-6.repo

		clear_cache

        ;;

        3)

        wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo

		clear_cache

        ;;

        *)

        echo "error number!"

esac

(3)删除用户

#!/bin/bash

#case 判断删除用户

read -p "please input username:" user

id $user &>/dev/null

if [ $? -ne 0 ];then

        echo "no such user:$user!"

        exit 1

fi

read -p "Are you sure?[y|n]: " action

case "$action" in

        y|Y|yes|YES)

                userdel -r $user

                echo "$user is deleted"

                ;;

        *)

                echo "error"

esac

(4)模拟jumpserver

#!/bin/bash

trap "" HUP INT OUIT TSTP

web01=192.168.111.201

web02=192.168.111.202

clear

while true

do

        cat <<-EOF

        +-----------------------------------+

        |         jumpserver                |

        |         1)connect---web01         |

        |         2)connect---web02         |

        |         3)out                     |

        +-----------------------------------+

        EOF

        echo -en "\e[1;32mplease input a number: \e[0m"

        read  num

        case "$num" in

                1)

                ssh $web01

                ;;

                2)

                ssh $web02

                ;;

                3)

                break

                ;;

                *)

                echo "error"

        esac

done

trap :运行脚本的时候无法使用crtl+c退出脚本

clear 每次登陆到后端服务器退出之后清屏

cat ：打印菜单

echo -en "\e[1;32mplease input a number: \e[0m" ：提示用户输入的时候打印颜色，-n表示下面的read用户输入不换行

，密钥登录：ssh-keygen：生成跳板机的公钥和私钥 ssh-copy-id  把跳板机的公钥发送给后端服务器

客户端登录到跳板机上每次启动这个脚本需要把脚本放入到~/.bashrc文件下面，脚本需要给执行权限

(5)系统工具箱

#!/bin/bash

#system_toolbox

menu() {

        cat <<-EOF

        +==========================================+

        |       h.help                             |

        |       f.disk partition                   |

        |       d.filesystem mount                 |

        |       m.memory                           |

        |       u.system load                      |

        |       q.exit                             |

        +==========================================+

        EOF

}

menu

trap "" HUP INT OUIT TSTP

clear

while true

do

        menu

        echo -en "please enter the options you need:"

        read options

        case "$options" in

                h) clear;menu ;;

                f) df -Th ;;

                d) fdisk -l ;;

                m) free -m ;;

                u) upload ;;

                q) break ;;

                "") ;;

                *) echo -e "\e[1;32merror options \e[0m"

        esac

done

echo -e "\e[1;32mfinish...... \e[0m"

(5)安装php

#!/bin/bash

menu() {

echo "##############################"

echo -e "\t1 php5.6"

echo -e "\t2 php6.6"

echo -e "\t3 quit"

echo "##############################"

}

. /server/scripts/php.sh

install_php56() {

        php56

}

install_php66() {

        php66

}

menu

while true

do

        echo -ne "version[1-2]:"

        read version

        case "$version" in

                1) install_php56 ;;

                2) install_php66 ;;

                3) break        ;;

                "") ;;

                *) echo "error"

        esac

done

php.sh

#!/bin/bash

php56() {

        echo -e  "\e[1;31minstall php5.6 is success\e[0m"

}

php66() {

        echo -e  "\e[1;33minstall php6.6 is suceess\e[0m"

}

总结：把安装php的各种版本一个文件，文件里面是函数安装php各种版本的函数，然后在入口文件使用. /server/scripts/php.sh加载这个文件，在定义函数调用文件中的函数功能即可

巴特西

（7）case语句

(1)case 语法

(2)多系统配置yum源

(3)删除用户

(4)模拟jumpserver

(5)系统工具箱

(5)安装php

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