I have to compare two text files, very few of the lines in these files will have some difference in some column.
The files size is in GB.
Sample lines are as below:
11111122222222333333aaaaaaaaaabbbbbbbbbccccccccdddddd
11111122222222333333aaaaaaaaaabbbbbbbbbccccccccddeddd

So assuming these two lines are from file1 and file2 respectively, I should get the second file line in a new output file which is the difference file.

What I would like to do is read line1 from file1 and loop through all the lines in file2 and stop when a match is found, else print it that line to output file. And repeat the same steps for all the lines from file1.

Appreciate any help in this regard.