If I add a few events to the input, this breaks. Try it with these data:

2550,531,66,10-12-2007 07:03:08.069,2
2549,529,62,10-12-2007 07:03:08.151,1
2550,531,66,10-12-2007 07:03:09.069,1
2549,529,62,10-12-2007 07:03:09.151,2
2550,531,66,10-12-2007 07:03:10.001,6
2550,531,66,10-12-2007 07:03:11.099,7

[download]

The output:

2550,531,66,10-12-2007 07:03:08.069,2
2549,529,62,10-12-2007 07:03:09.151,2
2550,531,66,10-12-2007 07:03:10.001,6
2550,531,66,10-12-2007 07:03:11.099,7

[download]

Ignore. I misread the specs.

In reply to Re^4: Compare fields in a file by Not_a_Number
in thread Compare fields in a file by honyok

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