目录：
1、批量生成随机字符文件名案例
2、批量改名特殊案例
3、批量创建特殊要求用户案例
1、批量生成随机字符文件名案例(P359)
(1)、利用openssl命令来实现
1 #!/bin/bash 2 # 3 path=/root/scripts 4 5 [ -d "$path" ] || mkdir -p $path 6 7 for n in `seq 10`; do 8 random=`openssl rand -base64 40 | sed 's@[^a-z]@@g' | cut -c 2-12` 9 touch $path/${random}_hanshan.html 10 done
(2)、利用RANDOM实现
# echo "hanshan$RANDOM" | md5sum | sed 's/[^a-z]//g' | cut -c 2-12
(3)、通过date获得随机数，纯数字
# date +%s%N | md5sum | cut -c 2-12
(4)、利用/dev/urandom配合cksum生成随机数
# head /dev/urandom | cksum | md5sum | cut -c 2-11
(5)、通过UUID生成随机数
# cat /proc/sys/kernel/random/uuid | md5sum | sed 's/[^a-z0-9]//g' | cut -c 2-12
(6)、利用expect命令附带的mkpasswd生成随机数(P258)
# mkpasswd -l 30 -d 5 -c 15 -C 5 -s 5 | md5sum | sed 's/[^a-z]//g' | cut -c 2-12
2、批量改名特殊案例(P360)
(1)、利用rename命令改名
# rename hanshan.html xiaoheshang.html *.html //把字符hanshan改为xiaoheshang
(2)、使用for循环遍历
1 #!/bin/bash 2 # 3 filename=xiaoheshang.html 4 dirname=/root/scripts 5 cd $dirname || exit 1 6 7 for n in `ls *.html`; do //列出所有以.html结尾的文件 8 name=$(echo ${n} | awk -F '_' '{print $1}') 9 mv $n ${name}_${filename} 10 done
(3)、使用mv拼接
1 #!/bin/bash 2 # 3 path=/root/scripts 4 cd $path || exit 5 ls *.html | awk -F '_' '{print "mv "$0" "$1"_hanshan.html"}' | bash
3、批量创建特殊要求用户案例(P360)
数字前加0 #echo {01.10} #seq -w 10
1、批量添加、删除10个用户
1 #!/bin/bash 2 # 3 4 #定义变量 5 . /etc/init.d/functions 6 user="hanshan" 7 passfile=/tmp/user.log 8 9 #判断文件是否存在，不存在则创建 10 [ -f $passfile ] || cd `dirname $passfile` && touch $passfile 11 12 #添加用户 13 add() { 14 for num in `echo {01..10}`; do 15 pass="`openssl rand -base64 40 | sed 's/[^a-z]//g' | cut -c 4-12`" 16 17 id $user$num &>/dev/null 18 if [ $? -eq 0 ]; then 19 echo "$user$num is exist" 20 continue 21 fi 22 23 useradd $user$num &>/dev/null 24 echo "$pass" | password --stdin $user$num &>/dev/null 25 echo -e "user:$user$num passwd:$pass">>$passfile 26 if [ $? -eq 0 ]; then 27 action "$user$num is ok" /bin/true 28 else 29 action "$user$num is fail" /bin/false 30 fi 31 done 32 33 echo ================================= 34 cat $passfile 35 } 36 37 #删除用户 38 del() { 39 for num in `echo {01..10}`; do 40 id $user$num &>/dev/null 41 if [ $? -ne 0 ]; then 42 echo "$user$num is not exist" 43 continue 44 fi 45 46 userdel -r $user$num &>/dev/null 47 if [ $? -eq 0 ]; then 48 action "$user$num is delete" /bin/true 49 else 50 action "$user$num is fail to delete" /bin/false 51 fi 52 done 53 cat /dev/null >$passfile 54 } 55 56 #选择 57 read -p "Please input your choice {add|del|quit}: " choice 58 case $choice in 59 add) 60 add ;; 61 del) 62 del ;; 63 quit) 64 exit ;; 65 *) 66 echo "your choice in {add|del|quit}" 67 esac
2、使用chpasswd,一个批量更新用户口令的工具
#echo "root:123456" | chpasswd
#chpasswd < 密码文件 //给多个用户设置密码，前提是密码文件不能为空
1 #!/bin/bash 2 # 3 4 . /etc/init.d/functions 5 user="hanshan" 6 passfile=/tmp/user.log 7 8 for num in `seq -w 10`; do 9 pass=$(echo "hanshan$RANDOM" | md5sum | cut -c 2-10) 10 useradd $user$num &>/dev/null 11 echo -e "$user$num:$pass">>$passfile 12 if [ $? -eq 0 ]; then 13 action "$user$num is ok" /bin/true 14 else 15 action "$user$num is fail" /bin/false 16 fi 17 done 18 19 echo ========================= 20 chpasswd < $passfile 21 cat $passfile && >$passfile
4、bash for循环打印下面这句话中字母数不大于6的单词
5、单词及字母去重排序(P373) //参考：
The months of learning in Old Boy education are the few months that I think the time efficient is the most.
I had also studied at other training institutions before, but I was hard to understand what the tutor said and hard to follow.
It was just too much to learn with no outline.
1、按单词出现频率降序排序！
2、按字母出现频率降序排序！
你好