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