thanks mate, in order to use your solution i need another piece of the puzzle:
lets say that i know the first row number (e.g. 50) but i need to find out the number of the bigger one. the only clue i have is that row 100 is starting with certain string (x).
between 50-100 x appears only on the 100 row, though after 100 it appears on various rows. do you have an idea how can i locate the number of that row?
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BTW i need this section for manipulating it in my bash script...
if you can help it will be highly appreciated.