linux - Filter specific lines with a given prefix from a file -

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I need to get the line before the last time of the prefix given on the whole file, the command I do Can I use (Sed or any other option)?

For example: (prefix is ​​the first two numbers of each row: for example, (16, 316) (0 312), etc.)

File.txt:

0 312 0

0 312 0

0 314 0> <31> 315 0

0 315 9380

0 315 0>

0 315 0

should be output:

16 316 32

0 312 2130 9

0 313 32732

0 314 19781

0 315 30388

Thanks

I assume those empty rows that the reality And your file is not in. 

  tac file.txt | Awk '$ 1' "$ 2! = Prefix {getline; Print; Prefix = $ 1 "" $ 2} "| Tac  
  16 316 32 312 21309 0 313 32732 0 314 19781 315 30388

Reverse the file. When I see a new prefix, print the next line and then reverse the output.


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