Difference between two text files

[vicky_ag]

I am generating output from a system which writes to a text file in this format:

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                           Headline   Headline   Headline   
                          Headline2     Headline2   Headline2
Describe11   Describe21   Describe31      100          200         300
                                Describe32     200         400          500
                                Describe33     700         800          650
                                Describe34     467         445          245
Describe12   Describe22   Describe31      100          200         300
                                Describe32     200         400          500
                                Describe33     700         800          650
                                Describe34     467         445          245

Spacing is tab delimited.

I have to compare two files with similar format and write a log if there were any differences. I was able to achieve it using fc command:

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fc 1.txt 2.txt > log.txt

Two additional conditions were added, write to log only if:
a. Differences in numbers (under Headline2, Headline3, Headline4) is more than 0.0001
b. Left most description is not "Describe12". So if it is Describe11, the log should be written

Is this doable using batch or powershell?

[foxidrive]

See here for some pointers: viewtopic.php?f=3&t=6108