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Full Discussion: How to get the latest and new values from the file in perl?
Top Forums Shell Programming and Scripting How to get the latest and new values from the file in perl? Post 302445294 by vanitham on Sunday 15th of August 2010 05:19:59 AM
Old 08-15-2010
Quote:
Originally Posted by durden_tyler
Your question is not clear.

Let's assume that your file looked like this before the process run -

Code:
StartTimeStamp,EndTimeStamp,Counter1,Counter2,Counter3,Counter4
Aug13 2010 02:49:21,Aug13 2010 02:54:21,9,8,0,0
Aug13 2010 02:59:32,Aug13 2010 03:00:00,0,0,0,0
Aug13 2010 03:00:00,Aug13 2010 03:04:32,9,8,0,0
Aug13 2010 03:07:55,Aug13 2010 03:08:55,0,0,0,0

And it looks like this after the process run -

Code:
StartTimeStamp,EndTimeStamp,Counter1,Counter2,Counter3,Counter4
Aug13 2010 02:49:21,Aug13 2010 02:54:21,9,8,0,0
Aug13 2010 02:59:32,Aug13 2010 03:00:00,0,0,0,0
Aug13 2010 03:00:00,Aug13 2010 03:04:32,9,8,0,0
Aug13 2010 03:07:55,Aug13 2010 03:08:55,0,0,0,0
Aug13 2010 04:07:55,Aug13 2010 04:08:55,1,0,0,0
Aug13 2010 04:10:55,Aug13 2010 04:13:55,2,0,0,0

(1) There were 4 records before the process run. They are in red color.
(2) The process appended 2 new records to the file. They are in blue color.
(3) There are 6 records now, after the process run.



What exactly do you want to compare ??
There are 4 + 2 = 6 records in the file. Each record has a bunch of fields.

Why not take the file shown above as your input and show us your expected output ? Please put it within [ code ] tags.

tyler_durden
Hi,

Thanks for the reply.

The file contents before the process is as shown below:

Code:
StartTimeStamp,EndTimeStamp,Counter1,Counter2,Counter3,Counter4
Aug13 2010 02:49:21,Aug13 2010 02:54:21,9,8,0,0
Aug13 2010 02:59:32,Aug13 2010 03:00:00,0,0,0,0
Aug13 2010 03:00:00,Aug13 2010 03:04:32,9,8,0,0
Aug13 2010 03:07:55,Aug13 2010 03:08:55,0,0,0,0

so the last output will be the last line or more Precisely the last line of the file (i.e last entry in the file) so the output is:
Code:
Aug13 2010 03:07:55,Aug13 2010 03:08:55,0,0,0,0

After some process is done the entries in the file get changed.

Code:
StartTimeStamp,EndTimeStamp,Counter1,Counter2,Counter3,Counter4
Aug13 2010 02:49:21,Aug13 2010 02:54:21,9,8,0,0
Aug13 2010 02:59:32,Aug13 2010 03:00:00,0,0,0,0
Aug13 2010 03:00:00,Aug13 2010 03:04:32,9,8,0,0
Aug13 2010 03:07:55,Aug13 2010 03:08:55,0,0,0,0
Aug13 2010 04:07:55,Aug13 2010 04:08:55,1,0,0,0
Aug13 2010 04:10:55,Aug13 2010 04:13:55,2,0,0,0

After the process what are the new entries in the file i have to check it. Here in this case Output is:
Code:
Aug13 2010 04:07:55,Aug13 2010 04:08:55,1,0,0,0
Aug13 2010 04:10:55,Aug13 2010 04:13:55,2,0,0,0

once this is done i need to split the array and get the values of Counter1,Counter2,Counter3,Counter4.

Basicaly i want to check for the new and old entries in perl.

This procedure how can i do it in perl?

Regards
Vanitha
 

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