Case 1: Bulk generate random characters in the file name case
For loop 10 batch create html files in / neo directory, wherein each file contains the name of the result needs to Example 10 random lowercase string plus fixed neo created as follows:
[root@oldgirl C19]# ls /neo apquvdpqbk_neo.html mpyogpsmwj_neo.html txynzwofgg_neo.html bmqiwhfpgv_neo.html mtrzobsprf_neo.html vjxmlflawa_neo.html jhjdcjnjxc_neo.html qeztkkmewn_neo.html jpvirsnjld_neo.html ruscyxwxai_neo.html
Refer to the following:
# Random number generation mode: echo $ the RANDOM # range of the random numbers: 0 ~ 32767 OpenSSL RAND -base64 10 # 10 indicates the length of the random number to be generated DATE + N% S% # made by the random number time head / dev / urandom | cksum uuidgen # 利用uuid cat /proc/sys/kernel/random/uuid the mkpasswd # need to install Expect; Expect yum the install -Y L Total length d digits Lowercase letters number c The number of uppercase letters C The number of special characters s # Example: [the root M01 @ ~] # the mkpasswd -l -d. 17 -C 20 is -s. 1. 1. 1 -C 1194S1242h756%909877 # Obtain a random 10 lowercase letters [root @ M01 ~] # echo "Oldboy $ the RANDOM" OLDBOY31600 [root @ M01 ~] # echo "Oldboy $ the RANDOM" | md5sum 2b33f154112a2f371beba1600d24f246 - [root @ M01 ~] # echo "Oldboy $ the RANDOM" | md5sum | TR 0-9 AJ icfafgebagjaajeieifeifabgfhfeegj - [root @ M01 ~] # echo "Oldboy the rANDOM $ "| md5sum | TR 0-9 AJ | Cut -c 2-11 afbagebbdf # obtain a random 10 lowercase letters [root @ M01 ~] # [root @ M01 ~] # mkpasswd the -l -d 0 -C 10 0 -c 10 -s 0 # to get 10 random lowercase letters tkbviqfovu [root@m01 ~]# echo " Oldboy $ the RANDOM " | md5sum | TR 0-9 AJ | Cut -c 2-11 echo " 123456 " | md5sum # View a string of md5 value CAT File | TR [0-9] [AJ] # the file the numbers 0-9 replaced AJ Cut -C 2-11 # -C parameter indicates the character line displayed only in the specified range # 示例代码： [root@m01 cases]# cat case01.sh #!/bin/bash ############################################################## # File Name: case01.sh # Version: V1.0 # Author: neo # Organization: anonymous # Created Time : 2019-07-04 11:15:30 # Description: ############################################################## path=/neo [ -D $ path] || mkdir -p $ path # if / neo directory does not exist, create for n in {1..10} do random=`mkpasswd -l 10 -d 0 -C 0 -c 10 -s 0` touch $path/${random}_neo.html done [root@m01 cases]# sh case01.sh [root@m01 neo]# ll total 0 -rw-r--r-- 1 root root 0 Jul 4 11:23 hqxdsueipv_neo.html -rw-r--r-- 1 root root 0 Jul 4 11:23 jpiauceiiy_neo.html -rw-r--r-- 1 root root 0 Jul 4 11:23 lagtetdxnu_neo.html -rw-r--r-- 1 root root 0 Jul 4 11:23 ogkstnleki_neo.html -rw-r--r-- 1 root root 0 Jul 4 11:23 qkljrkpckc_neo.html -rw-r--r-- 1 root root 0 Jul 4 11:23 rpslndkrjc_neo.html -rw-r--r-- 1 root root 0 Jul 4 11:23 snvcqbwlko_neo.html -rw-r--r-- 1 root root 0 Jul 4 11:23 tuwsslvcgn_neo.html -rw-r--r-- 1 root root 0 Jul 4 11:23 tzxismkjka_neo.html -rw-r--r-- 1 root root 0 Jul 4 11:23 wlaroblbvi_neo.html [root@m01 neo]#
Case 2: batch rename special cases
Above all neo string Case 1 results in a file name changed Neomaple, is best implemented for cycling and extensions into all uppercase html
Refer to the following:
# Way a: for loop [root @ M01 Cases] # CAT case02.sh # / bin / bash! For File in `LS / Neo / * .html` do mv $file /${file/neo.html/Neomaple.HTML} done [root@m01 cases]# # 方式二：awk [root@m01 neo]# ls *.html|awk -F "neo.html" '{print "mv",$0,$1"Neomaple.HTML"}' mv dbizjjvosl_neo.html dbizjjvosl_Neomaple.HTML mv ezoiojifzy_neo.html ezoiojifzy_Neomaple.HTML mv fanspikyqs_neo.html fanspikyqs_Neomaple.HTML mv hmvkxpoyru_neo.html hmvkxpoyru_Neomaple.HTML mv hymssbshwu_neo.html hymssbshwu_Neomaple.HTML mv kgavlirhts_neo.html kgavlirhts_Neomaple.HTML mv khxcbyrnnt_neo.html khxcbyrnnt_Neomaple.HTML mv ntgtztpzsp_neo.html ntgtztpzsp_Neomaple.HTML mv pfykhbwgyk_neo.html pfykhbwgyk_Neomaple.HTML mv sybwbmnmyh_neo.html sybwbmnmyh_Neomaple.HTML [root@m01 neo]# ls *.html|awk -F "neo.html" '{print "mv",$0,$1"Neomaple.HTML"}'|bash # Three ways: the rename [root @ M01 Neo] # . The rename "neo.html" "Neomaple.HTML" * .html # neo.html put into Neomaple.HTML; * html html represented the end of the file for
Case 3: Batch requires the user to create special cases
Bulk create 10 systems account neo01 - neo10 and set a password (the password is a random number, required characters and numbers mix)
# Analysis: 1) 01 to generate a sequence of 10: echo {01..10} seq -w 10 2 ) random number: openssl rand -base64 10 3 ) Create a user and password: neo01 useradd # Create a user # password Method 1: echo password | passwd - stdin username # password Method 2: chpasswd command When chpasswd password, user name and password to follow this format: Username: Password 4) for circulation # Way a: [the root @ M01 Cases] # CAT case03.sh # / bin / the bash! For n- in {01..10 } do the passwd = `10` -base64 OpenSSL RAND # save to make random password variable useradd neo $ n echo $passwd|passwd --stdin neo$n echo -e " Neo the n-$ \ t $ passwd " >> / tmp / user.list # to save the password to a file; the role of echo -e is to parse \ t DONE [root@m01 cases]# sh case03.sh Changing password for user neo01. passwd: all authentication tokens updated successfully. Changing password for user neo02. passwd: all authentication tokens updated successfully. Changing password for user neo03. passwd: all authentication tokens updated successfully. Changing password for user neo04. passwd: all authentication tokens updated successfully. Changing password for user neo05. passwd: all authentication tokens updated successfully. Changing password for user neo06. passwd: all authentication tokens updated successfully. Changing password for user neo07. passwd: all authentication tokens updated successfully. Changing password for user neo08. passwd: all authentication tokens updated successfully. Changing password for user neo09. passwd: all authentication tokens updated successfully. Changing password for user neo10. passwd: all authentication tokens updated successfully. [root@m01 cases]# cat /tmp/user.list neo01 pFvlvG0NXpIvYg== neo02 UPRO/U7uTxnJNw== neo03 0xkAtO5U70ws5w== neo04 wXR+K7fl+8i5wA== neo05 7bt6b09wv5dw7Q== neo06 AUNPXdRaJ8NUTA== neo07 E+JPwENB7KXHUA== neo08 1lZylckuf8rNlg== neo09 ZD7qVwMfsPMvzg== neo10 B3EgYyb/swvDow== [root@m01 cases]# su - neo01 [neo01@m01 ~]$ su - neo02 Password: [neo02@m01 ~]$ whoami neo02 [neo02@m01 ~]$ # Second way: [root @ M01 Cases] # CAT case0302.sh # / bin / bash! For the n- in `seq -w 11 15 ` do the passwd = `10` -base64 OpenSSL RAND # save to make random password variable useradd neo $ n echo " Neo $ the n-: $ passwd " >> / tmp / chpasswd.log # the user name and password Username: Password this format to save a file in chpasswd.log done chpasswd </tmp/chpasswd.log # to /tmp/chpasswd.log chpasswd this file to redirect output by the command processing, is due in chpasswd.log Username: Password format saved, so can deal directly with chpasswd command [root Cases M01 @] # SH case0302.sh [the root @ M01 Cases] # CAT /tmp/chpasswd.log neo11: Ij76k7pbfyByZQ == neo12: lmCPKpKoUP / UOG == neo13: JNIfuo8wwXgEkA == neo14: QkBxlLf6mhQP + G == neo15: fbvtdTSu9yTySg == [root @ M01 Cases] # su - neo11 [neo11 @ M01 ~] $ su - neo15 Password: [neo15 m01 @ ~ ] $ # Three ways: [root @ M01 Cases] # CAT case0303.sh # / bin / bash! /Etc/init.d/. Functions if [ $UID -ne 0 ] then action "only root can execute this script" /bin/false exit 1 be for n in {12..17} do the passwd = RAND -base64 OpenSSL `10 ` IF `grep -w! " Neo n-$ " / etc / the passwd &> / dev / null` # grep -w exact matching; grep corresponding result if obtained, the grep command execution result is 0 (true), otherwise execution result is 1 (false); if `command expression &> / dev / null` when the judgment result of the command execution of the expression is true (since the look results of this overtime &> / dev / null, or if the string will be error) the then # \ represent a newline character useradd the n-Neo $ &> / dev / null && \ echo $passwd|passwd --stdin neo$n &>/dev/null && \ echo -e "neo$n\t$passwd" >>/tmp/user.list && \ action "neo$n added successfully" /bin/true else action "neo$n exists already" /bin/false be done [root@m01 cases]# sh case0303.sh neo12 exists already [FAILED] neo13 exists already [FAILED] neo14 exists already [FAILED] neo15 exists already [FAILED] neo16 added successfully [ OK ] neo17 added successfully [ OK ] [root@m01 cases]#
Case 4: Scan the network memory alive hosts Case
Write a Shell script to determine 10.0.0.0/24 network, which currently online IP
1 ) the ping command [root@m01 ~]# ping -c 2 -i 1 -w 3 10.0.0.61 PING 10.0.0.61 (10.0.0.61) 56(84) bytes of data. 64 bytes from 10.0.0.61: icmp_seq=1 ttl=64 time=0.079 ms 64 bytes from 10.0.0.61: icmp_seq=2 ttl=64 time=0.052 ms --- 10.0.0.61 ping statistics --- 2 packets transmitted, 2 received, 0% packet loss, time 1005ms rtt min/avg/max/mdev = 0.052/0.065/0.079/0.015 ms ping command: - C number of ping - I of ping interval (s) - W of ping total duration (s) 2 ) nmap command nmap -sP 10.0.0.0/24 # 方式一： ping [root@m01 cases]# cat case0401.sh #!/bin/bash ############################################################## # File Name: case0401.sh # Version: V1.0 # Author: neo # Organization: anonymous # Created Time : 2019-07-05 00:54:20 # Description: ############################################################## for n in {1..254} do { if `ping -c 1 -w 3 10.0.0.$n &>/dev/null` # ping 通为true then echo "10.0.0.$n is up" else echo "10.0.0.$n is down" be } & # {} {} Indicates & concurrent execution of code inside; here indicates quantities of ping DONE [root@m01 cases]# # Second way: nmap [the root M01 @ ~] # nmap -sP 10.0.0.0/24 Starting Nmap 5.51 (http://nmap.org) AT 2019-07-05 01:34 CST Nmap scan report for 10.0.0.61 Host is up. Nmap scan report for 10.0.0.253 Host is up (0.0032s latency). MAC Address: 00:50:56:C0:00:08 (VMware) Nmap scan report for 10.0.0.254 Host is up (0.00081s latency). MAC Address: 00:50:56:EA:79:FB (VMware) Nmap done: 256 IP addresses (3 hosts up) scanned in 8.36 seconds [M01 the root @ ~] # nmap -sP 10.0.0.0/24|awk '/ Nmap Scan Report for / of NF} {Print $' # $ last Field (column) of NF expressed, i.e., the output of the contents of the last field 10.0.0.61 10.0.0.253 10.0.0.254 [root@m01 ~]#