day 14 11-15

例题11

#!/bin/bash
echo "*cmd meau**  1 - date 2 - ls 3 - who 4 - pwd"
read -p "Please input a number: " n
if [ -z "$n" ]
then
    echo "请输入一个纯数字,范围1-4."
    exit
fi

n1=`echo $n|sed 's/[0-9]//g'`
if [ -n "$n1" ]
then
    echo "请输入一个纯数字,范围1-4."
    exit
fi

case $n in 
    1)
        date
        ;;
    2)
        ls
        ;;
    3)
        who
        ;;
    4)
        pwd
        ;;
    *)
        echo "请输入1-4的数字"
        ;;
esac

例题12

[root@iZwz96qzfgxh9l2rk7esxnZ xiti]# vim 12.sh
#添加user_00 – user_09 10个用户,并且给他们设置一个随机密码,密码要求10位包含大小写字母以及数字
#!/bin/bash
for i in `seq -w 00 09`
do
    useradd user_$i
    p=`mkpasswd -l 10 -s 0 `
    echo "user_$i $p" >> /tmp/pass.tmp
    echo $p |passwd --stdin user_$i
done
~                                                                                                                                       
~                                                                                                                                       
~                   

例题13

[root@iZwz96qzfgxh9l2rk7esxnZ xiti]# vim 15.sh
#输出后面的十个数字。10 31 53 77  105 141 …….
#!/bin/bash
x=10
y=21
for i in `seq 0 15`
do 
    echo $x
    x=$[$x+$y]
    z=$[2**$i]
    y=$[$y+$z]
done
~             
[root@iZwz96qzfgxh9l2rk7esxnZ xiti]# vim 13.sh
#每隔10s去检测一次服务器上的httpd进程数,如果大于等于500的时候,就需要自动重启#一下apache服务,并检测启动是否成功若没有正常启动还需再一次启动,最大不成功数#超过5次则需要立即发邮件通知管理员,并且以后不需要再检测!如果启动成功后,1分钟后#再次检测httpd进程数,若正常则重复之前操作(每隔10s检测一次),若还是大于等于#500,那放弃重启并需要发邮件给管理员,然后自动退出该脚本。
#!/bin/bash
check_service()
{
    n=0
    for i in `seq 1 5`
    do
        /usr/local/apache2/bin/apachectl restart 2>/tmp/apache.err
        if [ $? -ne 0 ]
        then
            n=$[$n+1]
        else
            break
        fi
    done
    if [ $n -eq 5 ]
    then
        python mai.py "[email protected]" "httpd service down" `cat /tmp/apache.err`
        exit
    fi
}   
while true
do
    t_n=`ps -C httpd --no-heading |wc -l`
    if [ $t_n -ge 500 ]
    then
        /usr/local/apache2/bin/apachectl restart
        if [ $? -ne 0 ]
        then
            check_service
        fi
        sleep 60
        t_n=`ps -C httpd --no-heading |wc -l`
        if [ $t_n -ge 500 ]
        then
            python mai.py "[email protected]" "wrong" "the httpd process is busy."
            exit
        fi
    fi
    sleep 10
done

例题14

[root@iZwz96qzfgxh9l2rk7esxnZ xiti]# vim 14.sh
#统计ip访问次数,排序,如何标记每隔半小时,iptables计数器是一个重要的判断指标,函数(封IP、解封IP)
#!/bin/bash
block_ip()
{
t1=`date -d "-1 min" +%Y:%H:%M`
log=/data/logs/access_log
egrep "$t1:[0-9]+" $log > /tmp/tmp_last_min.log
awk '{print $1}' /tmp/tmp_last_min.log |sort -n |uniq -c|sort -n |awk '$1>100 {print $2}' > /tmp/bad_ip.list 
n=`wc -l /tmp/bad_ip.list|awk '{print $1}'`
if [ $n -ne 0 ]
then
    for ip in `cat /tmp/bad_ip.list`
    do
        iptables -I INPUT -s $ip -j REJECT
    done
fi
}

unblock_ip()
{
    iptables -nvL INPUT|sed '1d' |awk '$1<5 {print $8}' > /tmp/good_ip.list
    n=`wc -l /tmp/good_ip.list|awk '{print $1}'`
    if [ $n -ne 0 ]
    then
    for ip in `cat /tmp/good_ip.list`
    do
        iptables -D INPUT -s $ip -j REJECT
    done
    fi
    iptables -Z
}

t=`date +%M`
if [ $t == "00" ] || [ $t == "30" ]
then
   unblock_ip
   block_ip
else
   block_ip
fi

例题15

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转载自www.cnblogs.com/huzhendong/p/10223918.html