case

需求1：使用case实现nginx服务启停脚本。

[root@manager case]# cat case-2.sh 
#!/bin/bash
#Date： 2019-10-30
#FileName： case-2.sh
#Description： 

#定义环境变量
. /etc/init.d/functions
nginx_pid="/var/run/nginx.pid"

case $1 in
	start)
	if [ -f $nginx_pid ];then
		if [ -s $nginx_pid ];then
			action "nginx服务已启动" /bin/false
		else
			rm -f $nginx_pid
			systemctl start nginx &> /dev/null
			if [ $? -eq 0 ];then
				action "nginx启动成功" /bin/true
			else
				action "nginx启动失败" /bin/false
			fi
		 fi
	else
		systemctl start nginx &> /dev/null
		if [ $? -eq 0 ];then
			action "nginx启动成功" /bin/true
		else
			action "nginx启动失败" /bin/false
		fi
	fi
	;;
	

stop)
if [ -f $nginx_pid ];then
	systemctl stop nginx && 
	rm -f ${nginx_pid}
		action "nginx服务已停止" /bin/true
	else
		echo "${nginx_pid} : No such file or directory"
fi
;;

status)
if [ -f $nginx_pid ];then
	echo "PID $(cat $nginx_pid) is active..."
else
	echo "${nginx_pid}不存在，服务未启动"
fi
;;

  	reload)
	if [ -f $nginx_pid ];then
		nginx -t -c /etc/nginx/nginx.conf &> nginx.error
		rc=$?
		if [ $rc -eq 0 ];then
			action "nginx is reload" /bin/true
		else
			nginx_conf=$(cat nginx.error |awk -F "[ :]" 'NR==1 {print $(NF-1)}')
			nginx_line=$(cat nginx.error |awk -F "[ :]" 'NR==1 {print $NF}')
			read -p "是否进入${nginx_conf} 配置文件中的 ${nginx_line} 行修改： [ yes | no ]" select
				case $select in
					yes)
						vim ${nginx_conf} +${nginx_line}
						;;
					no)
						exit 2
				esac
		fi
	else
		action "nginx 没有启动" /bin/false

​	fi
​	;;

*)
	echo "USAGE:  $0 {start | stop | status | reload }"
		exit 3

esac

需求2：使用case实现nginx状态监控脚本。 stub_status

#!/bin/bash
#Date： 2019-10-30
#FileName： case-3.sh
#Description： 
Nginx_status_file=nginx.status
Nginx_status_Path=nginx_status

curl -sH Host:${HostName} http://127.0.0.1/${Nginx_status_Path} > ${Nginx_status_file}
case $1 in
	active)
		echo $(( $(awk '/Active/ {print $NF}' ${Nginx_status_file}) -1 ))
		;;
	accepts)
		echo $(( $(awk 'NR==3 {print $1}' ${Nginx_status_file}) -1 ))
		;;
	handled)
		echo $(( $(awk 'NR==3 {print $2}' ${Nginx_status_file}) -1 ))
		;;
	requests)
		echo $(( $(awk 'NR==3 {print $3}' ${Nginx_status_file}) -1 ))
		;;
	reading)
		echo $(( $(awk 'NR==4 {print $2}' ${Nginx_status_file}) -1 ))
		;;
	writing)
		echo $(( $(awk 'NR==4 {print $4}' ${Nginx_status_file}) -1 ))
		;;
	waiting)
		echo $(( $(awk 'NR==4 {print $NF}' ${Nginx_status_file}) -1 ))
		;;
	*)
		echo "USAGE: $0 { active | accepts | handled | requests | reading | writing | waiting }"
		exit 1

esac

需求3：使用case实现php-fpm状态监控脚本。

[root@web01 conf.d]# cat test.bao.com.conf 
server {
	listen 80;
	server_name test.bao.com;
	

location ~ ^/(phpfpm_status)$ {
include fastcgi_params;
fastcgi_pass 127.0.0.1:9000;
fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
}	

}

[root@manager case]# cat case-4.sh 
#!/bin/bash
#Date： 2019-10-30
#FileName： case-4.sh
#Description： 

HostName=test.cheng.bao.com
php_status_file=phpfpm.status
php_status_path=phpfpm_status

curl -sH Host:${HostName} http://10.0.0.7/${php_status_path} > ${php_status_file}

case $1 in
	pool)
		echo "$(awk '/pool/ {print $NF}' ${php_status_file})"
		;;
	process_manager)
		echo "$(awk '/process manager/ {print $NF}' ${php_status_file})"
		;;
	start_time)
		echo "$(awk  '/start time/{print $3,$4}' ${php_status_file})"
		;;
	start_since)
		echo "$(awk  '/start since/ {print $NF}' ${php_status_file})"
		;;
	accepted_conn)
		echo "$(awk  '/accepted conn/ {print $NF}' ${php_status_file})"
		;;
	listen_queue)
		echo "$(sed -n '6p' ${php_status_file} |awk '{print $NF}')"
		;;
	max_listen_queue)
		echo "$(awk '/max listen/ {print $NF}' ${php_status_file})"
		;;
	listen_queue_len)
		echo "$(awk '/queue len/ {print $NF}' ${php_status_file})"
		;;
	idle_processes)
		echo "$(awk '/idle processes/ {print $NF}' ${php_status_file})"
		;;
	active_processes)
		echo "$(sed -n '10p' ${php_status_file} |awk '{print $NF}')"
		;;
	total_processes)
		echo "$(awk '/total processes/ {print $NF}' ${php_status_file})"
		;;
	max_active_processes)
		echo "$(awk '/max active processes/ {print $NF}' ${php_status_file})"
		;;
	max_children_reached)
		echo "$(awk '/max children reached/ {print $NF}' ${php_status_file})"
		;;
	slow_requests)
		echo "$(awk '/slow requests/ {print $NF}' ${php_status_file})"
		;;
	*)
		echo "USAGE: $0 { pool | process_manager | start_time | start_since }"
		exit 1

esac

1：编写脚本，根据用户输入的服务名称查询该服务的状态，并让用户选择启动、关闭、重启、保持不变并输出该服务器以启动、关闭、重启、保持不变

[root@manager case]# cat case-6.sh 
#!/bin/bash

#判断当前执行脚本的是否为超级管理员
if [ $UID -ne 0 ];then
	echo ""$USER" $0 Permission denied"
	exit 
fi


#判断用户传入的参数
if [ $# -ne 1 ];then
	echo "USAGE: $0 Service Name [ nginx | httpd | vsftpd | rsyncd ]"
	exit
fi

systemctl status $1 &>/dev/null
if [ $? -eq 4 ];then
 	echo "Unit $1 could not be found."
else
	#字符串比对
	system_status=$(systemctl status $1|grep Active|awk '{print $2}')
	if [ $system_status == "active" ];then
		read -p "$1 已启动,你可以选择 [ restart | stop ] " Action
		case $Action in
			restart)
				systemctl restart $1
				echo "$1 重启成功......"
				;;
			stop)
				systemctl stop $1
				echo "$1 停止成功......"
				;;
			*)
				exit 1
		esac

#针对没有启动的服务,提示是否启动
elif [ $system_status == "inactive" ];then
	read -p "$1 未启动,可以选择 [ start | quit ] " Action2
	case $Action2 in
		start)
			systemctl start $1
			echo "$1 启动成功"
			;;
		quit)
			echo "Bye"
			exit
			;;
		*)
			exit
	esac
fi

 fi


方式二：
[root@manager case]# cat case-5.sh 
#!/bin/bash
#Date： 2019-10-30
#FileName： case-5.sh
#Description： 


read -p "请输入你要查询服务的名称：" Action
systemctl status ${Action} &> /dev/null
if [ $? -eq 0 ];then
	echo "Active: active (running)"
else
	echo "Active: failed"
fi

cat <<EOF
1)启动
2)停止
3)重启
4)退出
EOF

read -p "请输入你需要执行的操作：[ 1 | 2 | 3 | 4 ] " Nu
case ${Nu} in
	1)
		systemctl start ${Action}
		if [ $? -eq 0 ];then
			echo "$Action服务已启动"
		else
			echo "$Action服务未启动"
		fi
		;;
	2)
		systemctl stop ${Action}
		if [ $? -eq 0 ];then
			echo "$Action服务已停止"
			exit 1
		fi
		;;
	3)
		systemctl restart ${Action}
		if [ $? -eq 0 ];then
			echo "$Action服务已重启"
			exit 1

​	fi
​	;;
4)
​	echo "抱歉，没有这个服务，你可以去其他地方找找"

esac

2：输入两个数字，输出的两个数字加减乘除得四个的数（判断输入的是否为两个数字，输入的是否为数字）

[root@manager case]# cat case-6.sh 
#!/bin/bash
#Date： 2019-10-30
#FileName： case-6.sh
#Description： 

if [[ ! $1$2 =~ ^[0-9]+$ ]];then
	echo "你输入的不是数字"
	exit 1
fi
	if [ $# -ne 2 ];then
		echo "请输入两个数字：[ 1 | 2 ]"
		exit 1
		fi
echo "$1 + $2 = $[ $1 + $2 ]"
echo "$1 - $2 = $[ $1 - $2 ]"
echo "$1 * $2 = $[ $1 * $2 ]"
echo "$1 / $2 = $[ $1 / $2 ]"
echo "$1 % $2 = $[ $1 % $2 ]"

4：取出当前系统case日期、时间、当前有几个登陆用户、过去15分钟的平均负载、当前可用内存大小、当前系统空闲时间，输入到/tmp/txt.csv

[root@manager 作业题]# cat if2.sh 
#!/bin/bash
#Date： 2019-10-30
#FileName： if2.sh
#Description： 


Date=$(date +%F_%T)
User=$(w |awk '/up/ {print $6}')
Load=$(w |awk '/up/ {print $NF}')
Free=$(free -h |awk '/Mem/ {print $NF}')
Time=$(cat /proc/uptime |awk '{print $2}')

echo "当前系统时间：${Date}" > /tmp/txt.csv
echo "当前登录用户：${User}" >> /tmp/txt.csv
echo "当前系统过去15分钟的平均负载：${Load}" >> /tmp/txt.csv
echo "当前系统可用内存大小：${Free}" >> /tmp/txt.csv
echo "当前系统空闲时间：${Time}" >> /tmp/txt.csv

5：检测本机当前用户是否为超级管理员,如果是管理员,则使用 yum 安装 vsftpd,如果不是,则提示您非管理员
[root@manager 作业题]# cat if1.sh 
#!/bin/bash
#Date： 2019-10-30
#FileName： if1.sh
#Description： 

if [ $UID -eq 0 ];then
	echo "用户为超级管理员"
	yum install vsftpd -y &> /dev/null
else
	echo "抱歉，您不是管理员"

fi