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grep is also taking up a lot of time and memory

I wish to give line number from one point to another in sed command like this
sed -n 1,1000000p file1.txt >file2.txt
but variable line number $x,$x+100000 can i give it cos i tried and it was...

hey zaxxon it wont check for line by line i hope like comparing 1st line of file1 and 1st file of line2

Hi,
i want to compare 2 large files both around 300 mb. They are text files having only one column of numbers. I wish to get the unique values in file2. I tried using diff but it gave an error of...