shell-answer

01.
#!/bin/bash
. /etc/init.d/functions
dir=/var/log/disk
[ ! -d $dir ] && mkdir $dir -p
df -h > $dir/$(date +%F).log

02.
#!/bin/bash
. /etc/init.d/functions
awk '{print $1}' 1.log |sort|uniq -c |sort -rn
#awk '{a[$1]++}END{for (ip in a) print a[ip],ip}' 1.log |sort -nr
03.
#!/bin/bash
. /etc/init.d/functions
sum=0
for n in `ps aux|grep -v USER|awk '{print $6}'`
do
sum=$[$sum+$n]
done
echo $sum
04.
#!/bin/bash
. /etc/init.d/functions
ip=10.0.0.20
loss_status=`ping -c 3 -w 3 $ip|grep "packet loss"|awk -F "[,% ]+" '{print $6}'`


[ "`echo $ip |sed 's#[0-9]##g'`" != "..." ] && {
echo "mail $ip 脚本ip地址有错"
exit 2
}
chk(){
if [ ${loss_status} -eq 100 ];then
        echo "mail $ip 宕机了"
elif [ ${loss_status} -eq 0 ];then
        echo "$ip 在线" &>/dev/null
else
        echo "mail $ip 丢包率比较高，丢包率为${loss_status}"
fi
}

main(){
while true
do
        chk
        sleep 10
done
}

main

05.
#!/bin/bash
. /etc/init.d/functions
cd /abc 
ls *.txt  &>/dev/null
if [ $? -eq 0 ];then
        rename txt txt.bak *.txt
#find /abc  -type f  -name "*.txt.bak"|xargs -i mv {} {}.bak
##find /abc  -type f  -name "*.txt"|awk '{print "mv",$1,$1".bak"}'|bash
else
        echo "not found *.txt"
exit 2
fi
ls *.bak  &>/dev/null
if [ $? -eq 0 ];then
        tar czf abc.tar.gz *.bak
        rm *.bak -f
else
        echo "not found *.bak"
        exit 2
fi

ls abc.tar.gz &>/dev/null
if [ $? -eq 0 ];then
        tar xf abc.tar.gz 
         rename txt.bak txt *.txt.bak
else
        echo "not foud  abc.tar.gz"
        exit 2
fi

06.
#!/bin/bash
. /etc/init.d/functions
chk(){
if [ `ss -lntup|grep "\b80\b"|wc -l` -eq 0 ];then
        systemctl  restart httpd
fi
}
main(){
while true
do 
        chk
        sleep 30
done
}
main

07.
#!/bin/bash
. /etc/init.d/functions
remote_ip=10.0.0.10
bakdir=/backup/mysql
[ `ss -lntup|grep "\b3306\b"|wc -l` -eq 0 ]&&{
echo "mail mysql is down"
exit 2
}
[ ! -d $bakdir ]&& mkdir -p $bakdir
cd $bakdir
mysqldump -uroot -p123456 -B wordpress -x | gzip >wordpress_$(date +%F).sql.gz
rsync -avz  wordpress_$(date +%F).sql.gz rsync_backup@${remote_ip}::backup  --password-file=/etc/rsync.password
##############
find $bakdir -type f -name "*.sql.gz" -mtime +7 | xargs rm -f
08.
#!/bin/bash
. /etc/init.d/functions
logfile=/data/log/access.log
[ ! -f $logfile ]&&{
echo "not found $logfile"
exit 2
}
chk(){
if [ `grep "/b502/b" $logfile|wc -l`-gt 0 ];then
/etc/init.d/php-fpm restart
fi
}
main(){
while true 
do 
        chk
        sleep 10
done
}
main
09.
#!/bin/bash
#author:feko
#version:0.1
#description：...
. /etc/init.d/functions
del_line=`cat -n a.txt |sed -n '1,5p'|sed  -n '/[a-zA-Z]/p'|awk '{print $1}'`
sed -r -i '6,10s#[a-zA-Z]##g' a.txt
for i in ${del_line}
do
sed -i "${i}d" a.txt
done
10.
#!/bin/bash
#author:feko
#version:0.1
#description：用shell打印下面这句话中字母数小于6的单词。
. /etc/init.d/functions
world=`echo "Bash also interprets a number of multi-character options."|tr " " "\n"|awk -F "[ .]+" '{print $1}'`
for i in $world
do 
if [ `echo "$i" |wc -c` -lt 6 ];then
        echo "$i"
fi
done
11.
#!/bin/bash
. /etc/init.d/functions

chk(){
read -e -p "please input 1-4 number：" arg
case  $arg in
        1)
        date
        ;;
        2)
        ls
        ;;
        3)
        who
        ;;
        4)
        pwd
        ;;
        *)
        break
        ;;
esac
}
main(){
while true
do
        chk
        sleep 3
done
}
main
12.
#!/bin/bash
. /etc/init.d/functions

for i in `seq 0 1 9`
do
id user_0$i
if [ $? -ne 0 ];then
        useradd user_0$i
        password=`mkpasswd -l 10`
        echo "user_0$i $password">>/var/log/mkpasswd.log
        echo "$password"|passwd --stdin user_0$i
fi
done
13.
#!/bin/bash
#author:feko
#version1.0
#description：采用了函数，分模块来实现
. /etc/init.d/functions
#变量定义
##pg=`ps -C httpd --no-headers|wc -l`
pg=`pgrep  httpd|wc -l`
rehttp="systemctl restart http"
RETVAL=0
RETVAL1=0
RETVAL2=10

#默认10秒检查一次，判断进程数大于500，则返回8，小于则返回4
chk(){
        sleep $1
if [ $pg -gt 500 ];then
                RETVAL=8
        else
                RETVAL=4
fi
}
#判断重启是否成功，成功返回8失败返回4
judge_rehttp(){
if  [ $RETVAL -eq 8 ];then
        $rehttp
        [ $? -eq 0 ]&&RETVAL1=8||RETVAL1=4
fi
}

#重启失败则走这条路
restart_failure(){
if [ $RETVAL1 -eq 4 ];then
        for i in `seq 6`
        do
        if [ $RETVAL1 -eq 8 ];then
                break
        elif [ $RETVAL1 -eq 4 ];then
                judge_rehttp
        fi
        done
        [ $i -eq 6 ]&&{
        echo "mail  admin htptd restart is failure"
        exit 2
        }
fi
}
#重启成功则走这条路
restart_success(){
if [ $RETVAL1 -eq 8 ];then
        RETVAL2=60
        chk $RETVAL2
        if [ $RETVAL -eq 8 ];then
                echo "mail httpd pg is $pg"
                exit 3
        else
                RETVAL2=10
        fi
fi
}
#主函数
main(){
while true
do
        chk $RETVAL2
        judge_rehttp
        restart_failure
        restart_success
done
}
main
14.
#!/bin/bash
##description：防止恶意攻击
. /etc/init.d/functions

t1=`date +%Y:%H:%M`
logfile=/data/logs/access_log
ban_ip(){
egrep "$t1:[0-9]+" $logfile > /tmp/tmp_last_min.log
awk '{n[$1]++}END{for (i in n) print n[i],i}' /tmp/tmp_last_min.log |sort -nr |awk '$1>100{print $2}'>/tmp/bad_ip.log
n=`cat /tmp/bad_ip.log|wc  -l`
if [ $n -ne 0 ];then
        for ip in `cat /tmp/bad_ip.log`
    do
        if [ `iptables -nvL |grep $ip|wc -l` -eq 0 ];then
        iptables -I INPUT -s $ip -j REJECT
        fi
    done
fi
}
pass_ip(){
#pkts #计数器 
##iptables -Z 清空这些计数器 
iptables -nvL INPUT|sed '1,2d' |awk '$1<5 {print $8}' > /tmp/good_ip.list
n=`cat /tmp/good_ip.log|wc  -l`
    if [ $n -ne 0 ]
    then
    for ip in `cat /tmp/good_ip.log`
    do
        iptables -D INPUT -s $ip -j REJECT
    done
    fi
    iptables -Z
}
t=`date +%M`
if [ "$t" = "00" ] || [ "$t" = "30" ];then
   pass_ip
   ban_ip
else
   ban_ip
fi
15.
#!/bin/bash
. /etc/init.d/functions

a=10
b=150
n=0
echo -n "10 "
for ((a;a<b;n++))
do
tmp=$[2**n]
a=$[a+20+tmp]
echo -n "$a "
done
echo 
16.
#!/bin/bash
. /etc/init.d/functions
users_file=/tmp/users_file
awk -F: '{if($3>=1000) print $1,$3}' /etc/passwd>${users_file}
if [ -s ${users_file} ];then
n=`wc -l ${users_file}|awk  '{print $1}'`
        echo "有${n}普通用户"
else
        echo "没有普通用户"
fi