Sorry for that, it was a typo. The number of columns will match the data. So it should be like this: 
 
a,       b,    c,   d
aa,     12,     33,     102, 111
bb,     223,    24,     88, 56
aa,     99,     130,    21, 45
bb,     88,     90,     212, 500

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In reply to Re^8: Cutting text from the end of the file and adding it to the top by oysterperl
in thread Cutting text from the end of the file and adding it to the top by oysterperl

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