Hi guys,

I have about 6 files full of traceroute data which I need to analyze for changes (e.g. Differences in number of hops, how often the route changes).

The inside of the files look like this at the moment: 

13,4.69.137.70
14,4.69.134.70
15,4.69.134.113
16,4.69.135.185
17,4.69.134.246
18,4.68.18.75
19,4.59.0.10
20,124.211.34.129
21,203.181.100.61
22,118.155.197.140
23,124.211.10.66
24,163.139.130.138
25,163.139.124.57
26,202.215.179.1
27,202.215.179.11

13,4.69.137.74
14,4.69.134.70
15,4.69.134.113
16,4.69.135.185
17,4.69.134.246
18,4.68.18.11
19,4.59.0.10
20,124.211.34.121
21,203.181.100.61
22,118.155.197.140
23,124.211.10.66
24,163.139.130.138
25,163.139.124.57
26,202.215.179.1
27,202.215.179.11

13,4.69.137.70
14,4.69.134.78
15,4.69.134.125
16,4.69.135.185
17,4.69.134.250
18,4.68.18.139
19,4.59.0.10
20,124.211.34.121
21,203.181.100.189
22,118.155.197.140
23,124.211.10.66
24,163.139.130.138
25,163.139.124.57
26,202.215.179.1
27,202.215.179.11

etc.

[download]

I need to write code in perl that will:

1. Read the first section of data (A)
2. Compare it to the next section of data (B)
3. Print outfile if the Route/IPs have changed
4. Store the data again (B)
5. Compare it to the next section of data (C)
6. Repeat until the end of the file.

I have already googled to try and find a solution myself, but a lot of the questions asked on google relate to perl comparisons between two files, whereas I need to compare the data within a file only.

I tried myself to write the code which would do this, but I failed miserably. I was thinking along the lines of two loops that would alternate with each other after each line break, but to be honest I'm not sure if that would be the best method to compare the data.

If anyone could help me come up with an idea or solution to comparing the data, I would be incredibly grateful.

In reply to Best way to compare my data? by Lavezzi

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