system administration hw3 - shell script
DESCRIPTION
System Administration HW3 - Shell Script. chenyp. Requirements. File statistics (20%+10%) use one-line command to show files statistics Bonus(10%) script (20%) Write a shell script to parse log. A simple search platform (60%). File statistics. - PowerPoint PPT PresentationTRANSCRIPT
System Administration HW3System Administration HW3- Shell Script- Shell Script
chenyp
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Requirements
File statistics (20%+10%)• use one-line command to show files statistics
• Bonus(10%)
script (20%)• Write a shell script to parse log.
A simple search platform (60%)
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File statisticsFile statistics
Use one-line command to show File statistics. Print the sum of files’ size in the directory, find the largest
and the smallest files, and print its filenames, filesizes and owners. (not include subdirectories)
All commands should be concatenated using "|"(pipe) in one line.
Can not create temporary file. If the number of the largest or the smallest is more than one,
choose the last one. No “&&” “||” “>” “>>” “<“ .
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File statisticsFile statistics
Examples: % ls –l -rw-r--r-- 1 chenyp gcs 720 Nov 14 18:25 test -rw-r--r-- 1 chenyp gcs 720 Nov 14 16:55 test_a -rw-r--r-- 1 chenyp gcs 378 Nov 10 17:12 test_b -rw-r--r-- 1 chenyp gcs 397 Nov 13 16:59 test_c -rw-r--r-- 1 chenyp gcs 536 Nov 12 17:43 test_d -rw-r--r-- 1 chenyp gcs 191 Nov 14 17:25 test_e
% ./hw3_1.sh
Bonus(10%)• If you can do it with subdirectories, you will get extra 10%.
2222Max: test_a 720 chenypMin: test_e 191 chenyp
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scriptscript
Write a script to parse log for ssh bruteforce. Print the IP address and times descending. Syntax
• Parserlog.sh [-n number] –f file
• -n Show the most Nth times and its ip address. If n is none, show all and sorted by times descending.
• -f Log file Sample file:
– http://nasa.cs.nctu.edu.tw/logfile
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scriptscript
SSH bruteforceOnly parse these three formats
Nov 15 13:53:32 NASA sshd[12397]: Invalid user supporte from 84.73.134.84
Nov 15 13:53:35 NASA sshd[12399]: Invalid user soporte from 84.73.134.84
Nov 15 21:45:25 NASA sshd[16601]: error: PAM: authentication error for root from 122.229.6.189
Nov 15 22:00:36 NASA sshd[16765]: error: PAM: authentication error for root from 115.186.131.106
Nov 15 22:16:40 NASA sshd[16868]: error: PAM: authentication error for root from 67.206.169.146
Nov 15 22:31:59 NASA sshd[16964]: error: PAM: authentication error for root from 74.238.205.245
Nov 15 22:47:22 NASA sshd[17129]: error: PAM: authentication error for root from 70.247.71.201
Nov 15 16:28:15 bsd1 sshd[6587]: error: PAM: authentication error for illegal user onlyeric23 from 140.113.246.1
Example• % Parserlog.sh –n 3 –f /tmp/logfile• 70.247.71.201 7 times
• 82.207.96.161 6 times
• 208.124.238.246 5 times
• 115.186.131.106 5 times
• 140.113.47.207 5 times
• 95.155.122.12 5 times
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A simple search platformA simple search platform
Write a user-friendly search platform by using dialog(1) First, you should show a welcome message.
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A simple search platformA simple search platform
Second, you should use menubox for client to choose which service to provide.
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A simple search platformA simple search platform
Basic search:• Input a keyword.
• Go to the wiki and show the first introduction for the keyword.
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A simple search platformA simple search platform
Advanced search:• Input a keyword.
• Show the content for the keyword and use checklist to choose which information to display.
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A simple search platformA simple search platform
Mergedata• Input a keyword.
• Show the content for the keyword and use checklist to choose which information to merge.
• You should merge files to the wikimerge/keyword.tar.bz2
• The keyword.tar.bz2 contains the files client chosen.
• Java.tar.bz2 contains geography.txt history.txt Notes.txt Externel_links.txt
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A simple search platformA simple search platform
Show mergedata• First, you should display which files in the wikimerge/ and use
menubox for client to choose.
• And show all the content in the keyword.tar.bz2.
• Example: You should display the content of the
– geography.txt
– history.txt
– Notes.txt
– Externel_links.txt
If you choose the java.tar.bz2.
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HelpHelp
IRC channel #nctuNASA on freenode Newsgroup cs.course.sysadmin BBS bs2.to board CS-SysAdmin Email [email protected] Goto CSCC to ask professional 3F!