3、My Scripts

1、用for循环批量修改文件扩展名(P240)
2、使用专业改名命令rename来实现
3、通过脚本实现sshd、rsyslog、crond、network、sysstat服务在开机时自动启动(P244)  
4、打印99乘法表(P246)
5、用for循环打印1到100的和(P247)
6、批量创建10个系统账号,并设置密码(P255)
7、Linux系统产生随机数的6中方法(P257)
8、select循环(P259)
9break、continue、return、exit脚本演练
10、开发shell脚本实现为服务配置多个IP(P271)

11、利用RANDOM生成随机一段文字并利用md5sum加密保存到一个文件中,根据指定字符串(1ea2edc6fe31)找出破解其加密前的数字(P275)
12、通过C语言型的for循环语句打印数组元素(P283)
13、利用for循环语句打印字母数大于等于4的单词(P286)
14、批量检查多个网址是否正常(P287)
15、检查MySQL主从复制是否正常(P291)

            


1、用for循环批量修改文件扩展名(P240)


2、使用专业改名命令rename来实现

3、通过脚本实现sshd、rsyslog、crond、network、sysstat服务在开机时自动启动(P244)            
使用循环
#for i in `chkconfig --list | grep 3:on | awk '{print $1}'`; do chkconfig --level 3 $i off; done
通过bash命令
chkconfig --list | grep 3:off | grep -vE "iscsi|iscsid|multipathor|netconsole|netfs|rdisc|restorecond|saslauthd" | awk '{print " chkconfig " $1 " on "}' | bash

4、打印99乘法表(P246)

 1 #!/bin/bash
 2 #
 3 for num1 in `seq 9`; do
 4   for num2 in `seq 9`; do
 5     if [ $num1 -ge $num2 ]; then
 6       if (((num1*num2)>9)); then       //如果两个乘数相乘大于9,这是控制输出格式
 7         echo -en "${num1}x${num2}=$((num1*num2)) "    //结尾多一个空格
 8       else
 9         echo -en "${num1}x${num2}=$((num1*num2))  "   //结尾多两个空格
10       fi
11     fi
12   done
13 
14 echo " "
15 done
[root@C ~]# bash 99.sh 
1x1=1 
2x1=2 2x2=4 
3x1=3 3x2=6  3x3=9 
4x1=4 4x2=8  4x3=12 4x4=16 
5x1=5 5x2=10 5x3=15 5x4=20 5x5=25 
6x1=6 6x2=12 6x3=18 6x4=24 6x5=30 6x6=36 
7x1=7 7x2=14 7x3=21 7x4=28 7x5=35 7x6=42 7x7=49 
8x1=8 8x2=16 8x3=24 8x4=32 8x5=40 8x6=48 8x7=56 8x8=64 
9x1=9 9x2=18 9x3=27 9x4=36 9x5=45 9x6=54 9x7=63 9x8=72 9x9=81
View Code

5、用for循环打印1到100的和(P247)

1 #!/bin/bash
2 #
3 i=0
4 while ((i<=100)); do
5   ((sum=sum+i))
6   ((i++)) 
7 done
8 
9 echo $sum
方法1
1 #!/bin/bash
2 #
3 for ((i=1;i<=100;i++)); do
4   ((sum=sum+i))
5 done
6 
7 echo $sum
方法2

 # echo $(( (100+1) * 100/2))

6、批量创建10个系统账号,并设置密码(P255)

 1 #!/bin/bash
 2 #
 3 . /etc/init.d/functions
 4 user="cos"
 5 passfile="/tmp/user.log"
 6 
 7 echo ------this is my script for adding users------
 8 for num in `seq -w 10`; do
 9   useradd $user$num
10   pass="`echo "cos$RANDOM" | md5sum | cut -c 5-12`"
11 
12   echo -e "$user${num}:$pass" >>$passfile
13 
14   if [ $? -eq 0 ]; then
15     action "Add $user$num is ok." /bin/true
16   else
17     action "Add $user$num is fail." /bin/true
18   fi  
19 done
20 
21 echo "----------Add Users----------"
22 chpasswd < $passfile &>/dev/null   //读取密码文件进行密码设置
23 cat $passfile
批量添加密码1
 1 #!/bin/bash
 2 #
 3 . /etc/init.d/functions
 4 user="cos"
 5 passfile="/tmp/user.log"
 6 
 7 echo ------this is my script for adding users------
 8 for num in `seq -w 10`; do
 9   useradd $user$num
10   pass="`echo "cos$RANDOM" | md5sum | cut -c 5-12`"
11 
12   echo "$pass" | passwd --stdin $user$num &>/dev/null &&\ 
13   echo -e "user:$user$num\tpasswd:$pass" >>$passfile
14 
15   if [ $? -eq 0 ]; then
16     action "Add $user$num is ok." /bin/true
17   else
18     action "Add $user$num is fail." /bin/true
19   fi  
20 done
21 
22 echo "----------Add Users----------"
23 cat $passfile
批量添加用户2
#!/bin/bash
#
user="cos"
passfile="/tmp/user.log"

for num in `seq -w 10`; do
  id $user$num &>/dev/null
  if [ $? -eq 0 ]; then
    userdel -r $user$num
    echo "$user$num was delete."
  else
    echo "$user$num is not exist."
  fi  
done

cat /dev/null >$passfile 
批量删除用户

7、Linux系统产生随机数的6中方法(P257)

1、通过系统环境变量($RANDOM)实现

# echo "hello world$RANDOM" | md5sum | cut -c 5-13
66f32895e
1
2、通过openssl产生随机数   数字和大小写字符、特殊字符相结合

# openssl rand -base64 80
eTlRKlp2r6v/cMt4C3lkNpSU1i/NV8oCnzvMA35zyXLLzQObS3jpjeh5w3doNINk
MGl0gWXji4vupUDyIOUIGV1te25vn+EcJxEjKTt8wqg=
2
4、通过/dev/urandom配合chksum生成随机数

# head /dev/urandom | cksum
1284149441 4169
3
5、通过UUID产生随机数

# cat /proc/sys/kernel/random/uuid
4b3d6a51-990b-4993-b130-cc9dae5df37f
4
3、通过时间(date)产生随机数
# date +%s%N
1533976483650549026
5
6、使用expect附带的mkpasswd生成随机数

# yum install expect -y   //安装expect

# mkpasswd -l 9 -d 2 -c 3 -C 3 -s 1 | md5sum | cut -c 3-12

221d1f369b

相关参数说明:

-l:指定密码长度

-d:指定密码中数字的数量

-c:指定密码中小写字母的数量

-C:指定密码中大写字母的数量

-s:指定密码中特殊字符的数量
6 

8、select循环(P259)

 1 #!/bin/bash
 2 #
 3 select name in xiaohong xiaoming xiaoqiang; do
 4   echo $name
 5 done
 6
# bash 3.sh 
1) xiaohong
2) xiaoming
3) xiaoqiang
#? 1
xiaohong
#? 2
xiaoming
#? 3
xiaoqiang

采用数组做变量列表

1 #!/bin/bash
2 #
3 array=(hong ming qiang)
4 
5 select name in "${array[@]}"; do
6   echo $name
7 done
View Code

把命令结果作为变量列表

1 #!/bin/bash
2 #
3 
4 select name in `ls /etc`; do
5   echo $name
6 done
View Code

调整select循环菜单默提示符即利用select变量打印数字序号

 1 #!/bin/bash
 2 #
 3 
 4 PS3="Please select a num from menu:"   //PS3是控制select循环的提示符
 5 select name in hong qiang ming; do
 6   echo -e "You choice is:\n $REPLY) $name"  //REPLY是菜单项对应的数字,即用户输入的数字
 7 done
 8 
 9 # bash 1.sh 
10 1) hong
11 2) qiang
12 3) ming
13 Please select a num from menu:1
14 You choice is:
15  1) hong
16 Please select a num from menu:2
17 You choice is:
18  2) qiang
View Code 

9、breakcontinuereturn、exit脚本演练(P269)

 1 #!/bin/bash
 2 #
 3 
 4 if [ $# -ne 1 ]; then
 5   echo "Usage:$0 {break|continue|exit|return}"
 6   exit 1
 7 fi
 8 
 9 test() {
10   for ((i=0;i<=5;i++)); do
11     if [ $i -eq 3 ]; then
12       $*;          //如果$i=3,这里就接受函数外的参数,即test $*
13     fi  
14     echo $i
15   done
16   echo "I am in func."
17 }
18 
19 test $*
20 func_ret=$?
21 if [ `echo $* | grep return | wc -l` -eq 1 ]; then
22   echo "return is exit status:$func_ret"
23 fi
24 
25 echo "ok"
View Code

continue是终止当前循环执行下一次循环,break是跳出当前循环(if循环),return是不但终止当前循环还跳出当前函数,exit是直接推出脚本

10、开发shell脚本实现为服务配置多个IP(P271)

 1 #!/bin/bash
 2 #
 3 
 4 [ -f /etc/init.d/functions ] && . /etc/init.d/functions
 5 op() {
 6   if [ $1 == "del" ]; then
 7     list=`echo {157..147}`
 8   else
 9     list=`echo {147..157}`
10   fi  
11 
12   for ip in $list; do
13     if [ $ip -eq 150 ]; then
14       continue
15     fi  
16     ip addr $1 192.168.184.$ip/24 dev eth0 label eth0:$ip &>/dev/null
17     if [ $? -eq 0 ]; then
18       action "$1 $ip" /bin/true
19     else
20       action "$1 $ip" /bin/false
21     fi  
22   done
23 }
24 
25 case "$1" in
26   add)
27     op add ;;
28   del)
29     op del ;;
30   readd)
31     op del 
32     echo "Ip was deleted"
33     sleep 3
34     echo "Ip will add"
35     op add ;;
36   *)
37     echo "Usage:$0 {add|del|readd}"
38 esac
39                      
View Code

 

使用ifconfig配置别名IP

#ifconfig eth0:0 192.168.184.147/24 up     添加IP

#ifconfig eth0:0 192.168.184.147/24 down   删除IP

使用IP命令配置ip

#ip addr add 192.168.184.147/24 dev eth0 label eth0:147   添加IP

#ip addr del 192.168.184.147/24 dev eth0 label eth0:147   删除IP

11、利用RANDOM生成随机一段文字并利用md5sum加密保存到一个文件中,根据指定字符串(1ea2edc6fe31)找出破解其加密前的数字(P275)

 1 #!/bin/bash
 2 #
 3  
 4 #for n in {0..32767}; do   //生成随机数,并保存到文件里面
 5 #  echo "`echo $n | md5sum` $n" >>/tmp/1.log
 6 #done
 7 
 8 md5char="1ea2edc6fe31"    定义要查找的字符串
 9 #cat /tmp/1.log | while read line; do
10 while read line; do
11   if [ `echo $line | grep "$md5char" | wc -l` -eq 1 ]; then
12     echo $line
13     break
14   fi  
15 done </tmp/1.log
View Code

RANDOM随机数范围再0~32767   

读取文件中的每一行参考:https://www.cnblogs.com/demonxian3/p/7886177.html

数组

12、通过C语言型的for循环语句打印数组元素(P283)

 1 #!/bin/bash
 2 #
 3 array=(1 2 3 4 5 6)
 4 for ((i=0;i<${#array[*]};i++)); do
 5 echo ${array[i]}
 6 done
 7 
 8 #!/bin/bash
 9 #
10 array=(1 2 3 4 5 6)
11 for i in ${array[*]}; do
12   echo $i
13 done
View
 1 #!/bin/bash
 2 #
 3 array=(
 4   192.168.184.145
 5   192.168.184.146
 6   192.168.184.147
 7 )
 8 
 9 #for ((i=0;i<${#array[@]};i++)); do   //C语言for循环语法
10 #  echo "${array[i]}"
11 #done
12 
13 for n in ${array[*]}; do        //普通for循环语法
14   echo $n
15 done
View Code

静态数组:array=(1 2 3) 动态数组:array=($(ls))

打印所有数组:${array[*]}  ${array[@]}

打印数组长度:${#array[*]} ${#array[@]}

 1 #!/bin/bash
 2 #
 3 array=(
 4   192.168.184.145
 5   192.168.184.146
 6   192.168.184.147
 7 )
 8 
 9 #for ((i=0;i<${#array[@]};i++)); do
10 #  echo "${array[i]}"
11 #done
12 
13 for n in ${array[*]}; do
14   echo $n
15 done
View Code

13、利用for循环语句打印字母数大于等于4的单词(P286)

 1 #!/bin/bash
 2 #
 3 
 4 array=(I am exercising bash scripts I like it very much)
 5 
 6 #for ((i=0;i<${#array[*]};i++)); do
 7 #  if [ ${#array[$i]} -ge 4 ]; then
 8 #    echo "${array[$i]}"
 9 #  fi
10 #done
11 
12 for word in ${array[*]}; do
13   if [ `expr length $word` -ge 4 ]; then
14     echo $word
15   fi
16 done
View Code

14、批量检查多个网址是否正常(P287)

 1 #!/bin/bash
 2 #
 3 . /etc/init.d/functions
 4 
 5 check_count=0
 6 url_list=(
 7 http://www.baidu.com
 8 https://i.cnblogs.com
 9 https://hao.360.cn
10 http://www.ninini
11 https://www.sina.com.cn
12 )
13 
14 wait() {
15   echo -n '3秒后,执行检查URL操作.';
16   for ((i=0;i<3;i++)); do
17     echo -n ".";sleep 1
18   done
19   echo
20 }
21 
22 check_url() {
23   wait
24   for ((i=0;i<${#url_list[*]};i++)); do
25     wget -T 3 --tries=2 --spider ${url_list[$i]} &>/dev/null
26     if [ $? -eq 0 ]; then
27       action "${url_list[$i]}" /bin/true
28     else
29       action "${url_list[$i]}" /bin/false
30     fi  
31   done
32   ((check_count++))
33 }
34 
35 main() {
36   while true; do
37     check_url
38     echo "----------check count:${check_count}-----------"
39     sleep 3
40   done
41 }
42 
43 main
View Code

15、检查MySQL主从复制是否正常(P291)

slave.log

Slave_IO_Running:No
Slave_SQL_Running:No
Seconds_Behind_Master:0

 1 #!/bin/bash
 2 #
 3 
 4 status=($(awk -F ':' '/_Running|_Behind/{print $NF}' slave.log))
 5 
 6 for ((i=0;i<${#status[*]};i++)); do
 7   count=0
 8   if [ "${status[${i}]}" != "yes" -a "${status[${i}]}" != 0 ]; then
 9     let count+=1
10   fi  
11 done
12 
13 if [ $count -ne 0 ]; then
14   echo "mysql replcation is failed"
15 else
16   echo "mysql replcation is success"
17 fi
View Code
posted @ 2018-08-03 22:46  Study~Column  阅读(306)  评论(0编辑  收藏  举报