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man comm

https://www.unix.com/shell-programming-and-scripting-q-and-a/40526-problem-comparing-2-files-with-lot-of-data.html

try with comm it worked for me, i had to find the diferences between two files, here is the url of my problem's post, good luck
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Thanks to porter lorcan and ygor

Porter, your solution was not possible to perform because it needs a lot of memory (diff uses 6 times the size of the file in memory), and bdiff didn´t get exact...

Hello everyone, here's the scenario

I have two files, each one has around 1,300,000 lines and each line has a column (phone numbers). I have to get the phones that are in file1 but not in file2. I...