compare 2 files, output dups to file

blt123 · #1 (**permalink**) 07-14-2004

I have two files that I want to compare and output a new file that will contain the duplicates. I have tried comm -12 and it doesn't work? Any help will be helpful.

Thanks,
Barbara

zazzybob · #2 (**permalink**) 07-14-2004

comm -12 should do what you want, provided you redirect the output to a new file, and (this is the biggy) ensuring that both input files are SORTED.

Code:

sort file1.txt > file1_sorted.txt
sort file2.txt > file2_sorted.txt

comm -12 file1_sorted.txt file2_sorted.txt > file3_dups.txt

more file3_dups.txt

blt123 · #3 (**permalink**) 07-15-2004

Thanks - sorting is the key obviously!

Much appreciated.....

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