shell初始化脚本

#!/usr/bin/bash
stty erase ^H
userip=`env |grep 'SSH_CLIENT'|awk '{print $1}'`
a=`ip a |grep 'scope global'|awk '{print $2}'`
ip=${a%/*}
time=`date |awk '{print $1 $2 $3 $4 $5 }'`
sdfree=`df -h|grep 'root'|awk '{print $4}'`
free=`free -m|grep 'Mem'|awk '{print $4}'`M
cat <<eof
+--------------+-------------------------------
| 当 前 用 户  |$USER                               
|--------------+-------------------------------
| 当 前 时 间  |$time                   
|--------------+-------------------------------
| 当前服务器ip |$ip                     
|--------------+-------------------------------
| ssh远程机ip  |${userip#*=}
|--------------|-------------------------------
| 磁 盘 空 闲  |$sdfree        
|--------------|-------------------------------
| 内 存 空 闲  |$free
|----------------------------------------------
eof
  sleep 4
clear
 while 1>0 
  do
cat <<eof
  +--------------------------------------+
  | 作者:+_+ 海涛                    |    
  |                                      |
        |          优 化 脚 本 v 2.0         |
  |                                      |
  |--------------------------------------|
  |          1.检查网络状态              |
  |          2.检查yum能否正常使用       |
  |          3.关闭防火墙和selinux       |
  |          4.配置阿里源和epel源        |
        |          5.安装基本软件              |
  |          6.重启服务器                |
        |          7.退出脚本                  |
  +--------------------------------------+
eof
echo  "请输入数字选项！" && read var
case "$var" in
"1")
  ping -w1 -c1 www.baidu.com &>/dev/null
        if [ $? -eq 0 ];then
  echo "网络正常，可以上网"
  else
  echo "无网络，请手动检查"
  fi
  wait 
  sleep 2
  clear
  ;;
"2") 
  yum clean all &>/dev/null
  yum makecache 
  if [ $? -ne 0 ];then
  echo "yum启动失败.请手动检查" 
  sleep 2
  exit 9
else 
  echo "yum状态正常.可以使用"
  fi 
  sleep 2
  clear
  ;;
"3")  
  systemctl  stop firewalld 
  systemctl  disable firewalld 
  setenforce 0
  sed -i s#SELINUX=enforcing#SELINUX=disabled# /etc/selinux/config  
if [ $? -eq 0 ];then  
  echo '防火墙已关闭'
  sleep 2 && clear  
else  
  echo '防火墙关闭失败.可能selnux已经关闭.请手动检查'
  fi
  sleep 2
  clear
  ;;
"4")  
  yum -y install wget
  yum -y install elinks
  mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.backup
  echo "备份本地源成功"
wait
  wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo
  echo "下载阿里源成功"
wait
  wget -O /etc/yum.repos.d/epel.repo http://mirrors.aliyun.com/repo/epel-7.repo
if test "$?" = "0";then
        echo "配置阿里epel源成功"
  sleep 2
  clear
        else
        echo "配置失败_请手动检查"
        sleep 2
        exit 6
fi
  ;;
"5")  
  yum -y install net-tools psmisc tree bash-completion
  sleep 2
  clear
  ;;  
"6")  
  read -p " 正常重启,如不重启请按 ctrl+c 强制退出脚本！"
  sleep 3
  shutdown -r now 
  ;;
"7")  
  exit
  ;;
*)  
  echo "请输入数字选项,输入有误！"
  sleep 2
  clear 
esac
done