#!/bin/bash
if [ -e ~/test.sh ];then
   echo "test.sh文件存在"
   if [ -x ~/test.sh ];then
      echo "test.sh文件有执行权限"
   else
      echo "test.sh文件没有执行权限"
   fi
else
  echo "test.sh文件不存在"
fi

#!/bin/bash
read -p "请输入你100米赛跑的秒数：" time
if [ $time -gt 0 -a $time -le 10 ];then
   echo "恭喜你进入选拔赛"
read -p "请输入你的性别（女或者男）" sex
   if [ $sex = ‘女‘ ];then
      echo "恭喜你进入女生组"
   elif [ $sex = ‘男‘ ];then
      echo "恭喜你进入男生组"
   else
      echo "输入有误！"
   fi
elif [ $time -gt 10 ];then
   echo "很遗憾，你已被淘汰"
else
   echo "输入有误，请重新输入"
fi

#!/bin/bash
case $1 in
*.gz)
  tar zxvf $1 -C /opt
;;
*.bz2)
  tar jxvf $1 -C /opt
;;
*)
  echo "格式错误"
;;
esac

#!/bin/bash
# this is determine the odd number of documents

read -p "请输入一个数: " num

expr $num + 0 &> /dev/null

if [ $? -eq 0 ];then
        echo "$num是整数！"
        a=$[ $num % 2 ]
        if [ $a -eq 0 ]
        then
          echo "$num是偶数"
        else
          echo "$num是奇数"
        fi
else
  echo 你输入的不是整数！
fi

#!/bin/bash
#Determine whether the host is alive

ping -c 3 -i 0.5 -w 2 $1 &> /dev/null

if [ $? -eq 0 ];then
   echo "host is online"
else
   echo "host is offline"
fi

#!/bin/bash
#Administrative firewalld

read -p "请输入管理防火墙的需求（start|stop|restart|status）：" need

case $need in
start)
     systemctl start firewalld
     echo "防火墙已开启"
;;
stop)
    systemctl stop firewalld
    echo "防火墙已关闭"
;;
restart)
    systemctl restart firewalld
    echo "防火墙已重启"
;;
status)
    systemctl status firewalld
    echo "查看防火墙状态"
;;
*)
   echo "用法: $0 {start|stop|status|restart}"
esac