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System Administration HW3 - Shell Script

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.

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System Administration HW3 - Shell Script

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  1. System Administration HW3- Shell Script chenyp

  2. 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%)

  3. File 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 “&&” “||” “>” “>>” “<“ .

  4. File 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%.

  5. script • 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

  6. script • SSH bruteforce Only 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

  7. A simple search platform • Write a user-friendly search platform by using dialog(1) • First, you should show a welcome message.

  8. A simple search platform • Second, you should use menubox for client to choose which service to provide.

  9. A simple search platform • Basic search: • Input a keyword. • Go to the wiki and show the first introduction for the keyword.

  10. A simple search platform • Advanced search: • Input a keyword. • Show the content for the keyword and use checklist to choose which information to display.

  11. A 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

  12. A 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.

  13. Help IRC channel #nctuNASA on freenode Newsgroup cs.course.sysadmin BBS bs2.to board CS-SysAdmin Email ta@nasa.cs.nctu.edu.tw Goto CSCC to ask professional 3F!

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