find non-matching lines of two files bash

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I'm still new to bash and I've found similar questions to mine, but i still can't solve my problem. I have two files with 2 columns each, separated by a space.

file 1:

1 AGCATTTTTCAAACGAAAGATTTACTACCGATGTGT  
2 TGCTCACCAACAAAAACAGGCGTCTCAGCAGCAGCA  
3 GATCGAACCGGCTGCCTACTGCGTGTAAAGCCGCCC  
4 CCGACACAGAGAACATTAGAATACTCAGAGCCATNN   
5 TAAGCCTGAGCCTAAACCTAAGCCTAAACATAAGAA  
6 AGCAGAGAAGAGATGAGTTGTCGAGTGAGGCGTAAG  
7 AACGTTGAAAAATTATCCCGTCAACAGTCTCCAGAA  
8 GCCAGAGAGTAAAATATTGGGTGAAGCCAGAGAGTA  
9 TGCTCACCAACAAAAACAGGCGTCTCAGCAGCAGCA  

file 2:

1 AGCATTTTTCAAACGAAAGATTTACTACCGATGTGT  
2 TGCTCACCAACAAAAACAGGCGTCTCAGCAGCAGCA  
3 NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN  
4 CCGACACAGAGAACATTAGAATACTCAGAGCCATNN  
5 TAAGCCTGAGCCTAAACCTAAGCCTAAACATAAGAA  
6 NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN  
7 NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN  
8 GCCAGAGAGTAAAATATTGGGTGAAGCCAGAGAGTA  
9 NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN

I'd like to compare only the second columns of each file, line by line, and output a third file with only the non-matching lines.

output:

3 NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
6 NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
7 NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
9 NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN

asked 1 min ago

agrobins

1

find non-matching lines of two files bash