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Using dd or similar tools to recover data from 2 damaged cdroms, I need a way to then combine the 2 files, 1 from each cd, and make a good file: this all result from finding that certain cd's tops...

That works fantastically. Thanks so much, I tried

awk '
NR > 24 {
if ( NF == 2 )
{
a=$1;b=$2; print "//"$0 ;
getline c; print "//"c ;
getline;
}
print a "\t" b "\t" c "\t" $0 } '...

I was wondering if there was a way to modify a tab delimited text file, up to 185,000 lines long by adding a repeated field to a block of 20 data , then repeat the process until the file is...