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Filtering similar lines in a big list

 
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# 1  
Old 03-14-2010
Question Filtering similar lines in a big list
I received this question for homework:
Quote:
The School of IT webmaster has noticed that visitors sometimes can't find web pages because they use incorrect capitalisation in the URL.
How often does this happen?

You can tell when URL is incorrect because the HTTP response code (the second last field in access_log.txt) has the value 404, which means not found.
A successful request has the response code 200.

You must print requests which only differ by their capitalisation where one was successful (code 200) and the other was not (code 404).
For example, if the two lines appear in access_log.txt:
65.214.44.112 -... "GET /~user1/HELLO/world HTTP/1.0" 404 -
...
68.142.251.190 ... "GET /~user1/hello/WORLD HTTP/1.0" 200 10
then your program should print out each URL converted to lowercase, in alphabetical order:
/~user1/hello/world

You can assume that no requested files appeared or disappeared during the period covered by access_log.txt.
We have to write our program into a .sh file, with "#!/bin/bash" as the first line. And we have the list of access logs in a file, looking like this (it's nearly 10,000 lines long):

Code:
65.214.44.112 - - [01/Feb/2008:00:06:44 +1100] "GET /~user0/cgg/msg08400.html HTTP/1.0" 304 -
203.109.124.175 - - [01/Feb/2008:00:15:17 +1100] "GET /~user39/ss_logo.jpg HTTP/1.1" 304 -
68.142.249.191 - - [01/Feb/2008:00:18:42 +1100] "GET /~user11/resnik/fsbt_viewreview?PERSON=Naz&BT_ID=9 HTTP/1.0" 200 7729
81.156.30.154 - - [01/Feb/2008:00:26:12 +1100] "POST /~user0/cgi-bin/hail_stone_coker.cgi HTTP/1.1" 200 185
65.214.44.112 - - [01/Feb/2008:00:31:11 +1100] "GET /~user0/cgg/msg00211.html HTTP/1.0" 304 -
68.142.249.127 - - [01/Feb/2008:00:31:34 +1100] "GET /~user44/examples/chapter5/example5.py HTTP/1.0" 200 334
145.64.134.244 - - [01/Feb/2008:00:32:18 +1100] "GET /~user20/ppgraph/ppg_create.2bp HTTP/1.0" 200 1070

How should I do this question? I know how to use 'cut' to get the section required as the answer, and i used 'egrep' to filter out the lines that do not contain neither 200 or 404. What should I do next. I'm completely lost in terms of matching the requests with same URLs but different response codes.

Thanks for the help guys.
# 2  
Old 03-14-2010
First, if this is really homework, you should be posting it here...

Homework & Coursework Questions - The UNIX and Linux Forums

Secondly, the example you provide doesn't have same URL name and different response code so it is impossible to work on your example.

regards,
 
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