System Administration HW3 - Shell Script

1. System Administration HW3 - Shell Script hchung

2. Requirements • User connect time statistic script (10%) • Use one-line command to show user connect time statistic. • Spamming system (40%) • Send massive mails with customized template and database. • GUI port manager (50%) • Manage your ports with dialog boxes.

3. User Connect Time Statistic Script – Requirements (1/2) • Use one-line command • The following lines should NOT be counted • User still logged in • shutdown, reboot or other msgs not associated with accounting • log file location • Use environment variable ‘LOG_FILE’ • Default to /var/log/utx.log • Results should be sorted by time • Output format • USER TIME (in seconds)

4. User Connect Time Statistic Script – Requirements (2/2) • Only pipes (cmd | cmd) and backquotes (`cmd`) are allowed • No temporary files or shell variables (except LOG_FILE) • No “&&” “||” “>” “>>” “<“ “;” “&”

5. User Connect Time Statistic - DEMO • Hint: $ man last

6. Spamming System – Sendmail • $ sendmail –t < letter • Sample letter • sendmail(8), base64(1) From: =?UTF-8?B?6auY5omLCg==?=<hchung@cs.nctu.edu.tw> To: =?UTF-8?B?5Y6y5a6zCg==?= <hwchiu@cs.nctu.edu.tw> Subject: =?UTF-8?B?6auY5omL5Y6y5a6z5LiN57Ch5ZauCg==?= Content-Transfer-Encoding: base64 Content-Type: text/plain; charset=utf-8 5L2g5piv6auY5omL5L2g5Y6y5a6zCuaIkeaYr+mCsea4o+S4jeewoeWWrgo=

7. Spamming System – Requirements (1/3) • $ hw2 [-hv] [-f from_address] [-F from_name] [-s subject] [-c content_file] -t table_file • If neither –f nor –F is provided, use default sender. • Show usage and exit if running with invalid or –h option. • Use –c option to read content from “file” instead of “stdin”. • In –v mode, print out letter instead of sending. • UTF-8 should be supported. • There will be escaped characters in subject and content_file. • %i should be replaced by elements in the table_file • Do NOT need to implement fool-proof.

8. Spamming System – Requirements (2/3) • Table file • %1 is recipient’s address • %2 is recipient’s name • Use “\t” to split columns • No specific table size %3 %2 計算機系統管理學期成績 %3%2 同學您好， 您的 計算機系統管理 學期成績為 %4分， %5 及格。 若對成績有疑問請直接回信到ta@nasa.cs.nctu.edu.tw。 ＳＡ助教關心您！ Content file and subject (contains escaped characters %i) Table file (uses “\t” as delimiter) %1 %2 %3 %4 %5 hchung@cs.nctu.edu.tw 鍾 翔 0156038 99 有 hwchiu@cs.nctu.edu.tw 邱宏瑋 0156521 55 沒有

9. Spamming System – Requirements (3/3) • hw2.sh -f sata@nasa.cs.nctu.edu.tw -F "計算機系統管理助教“ -s "%3 %2 計算機系統管理學期成績" -c demo_c -t demo_t • http://nasa.cs.nctu.edu.tw/sysadm/hw3/demo_t • http://nasa.cs.nctu.edu.tw/sysadm/hw3/demo_c • http://nasa.cs.nctu.edu.tw/sysadm/hw3/output Example options Sample result

10. Spamming System – DEMO • Hint • getopt(1)

11. My Ports Manager – DEMO

12. My Ports Manager – DEMO (List)

13. My Ports Manager – DEMO (Manage)

14. My Ports Manager – DEMO (Manage)

15. My Ports Manager – DEMO (Manage)

16. My Ports Manager – DEMO (Manage)

17. My Ports Manager – DEMO (Manage)

18. My Ports Manager – DEMO (Install)

19. My Ports Manager – DEMO (Install)

20. My Ports Manager – DEMO (Install)

21. My Ports Manager – DEMO (Install)

22. My Ports Manager – Requirement (1/2) • Use sudo to add/delete ports • Clean all temp files • Use dialog on Freebsd 9 • Fool-proof

23. My Ports Manager – Requirement (2/2) • Flow • List • Manage • Choose SEVERAL ports • Show dependency • Required by who • Remove • Exit • Install • Prefix • Choose ONE port • By binary • By source • Exit • Exit

24. My Ports Manager – Hint • dialog(1) • ports-mgmt/pkg_tree • pkg_info, pkg_delete, pkg_add • make install clean BATCH=yes • /usr/ports/INDEX-9 • xargs

25. Hand-in • Due & Demo • 2012/11/20

26. 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!