Remove lines from .txt gawk

Question

Okay so how do I remove lines from new.txt if they're in tried.txt,

For example, if new.txt contains 123 and tried.txt contains 123, so remove 123 from in.txt and output results to new2.txt.

Any chance you could put your description over multiple lines to make it easier to read? Also, what have you done to try and solve this problem? — grail, Feb 16 '17 at 15:07
At the very minimum, you need to create some sample input files and the desired output: https://stackoverflow.com/help/mcve — glenn jackman, Feb 16 '17 at 16:04
Possible duplicate of [Remove Lines from File which appear in another File](http://stackoverflow.com/questions/4366533/remove-lines-from-file-which-appear-in-another-file) — pii_ke, Feb 16 '17 at 17:35

score 0 · Answer 1 · edited May 23 '17 at 11:46

Using grep:

grep -F -x -v -f tried.txt new.txt > new2.txt

Using awk:

awk "NR==FNR{a[$0];next} !($0 in a)" tried.txt new.txt > new2.txt

Any of the above commands should work for you. See:

1 Answers1