bash delete lines in file containing lines from another file

Question

file1 contains:

someword0
someword2
someword4
someword6
someword8
someword9
someword1

file2 contains:

someword2
someword3
someword4
someword5
someword7
someword11
someword1

So I wan't to have only lines from file1 which file2 doesn't contains. How can I do this in bash ?

That's the answer:

grep -v -x -f file2 file1

    -v for select non-matching lines
    -x for matching whole lines only
    -f f2 to get patterns from f2.

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) — tripleee, Oct 05 '14 at 17:44
Better duplicate: http://stackoverflow.com/questions/4780203/deleting-lines-from-one-file-which-are-in-another-file — tripleee, Oct 05 '14 at 17:47
Yeah. I searching in google but I haven't found this. Thanks. — devbgs, Oct 05 '14 at 17:50

score 1 · Accepted Answer · answered Oct 05 '14 at 17:40

1

You can use grep -vf:

grep -vwFf file2 file1
someword0
someword6
someword8
someword9

Check man grep for detailed info on all the grep options used here.

answered Oct 05 '14 at 17:40

anubhava

score 1 · Answer 2 · answered Oct 05 '14 at 17:47

1

You could use the comm command as well:

comm -23 file1 file2

Explanation:

comm compares two files and prints, in 3 columns, lines unique to file1, file2, and lines in both.

Using the options -2 and -3 (or simply -23) suppresses printing of these columns, so you just get the lines unique to file1.

answered Oct 05 '14 at 17:47

Travis

1

This does require the files to be sorted lexically. – glenn jackman Oct 05 '14 at 18:56

score 0 · Answer 3 · answered Oct 05 '14 at 20:19

0

If your lines are unique, do a left join and filter out lines that exist in both tables.

join <(sort file1) <(sort file2) -o0,2.1 -a1 | awk '!$2'

answered Oct 05 '14 at 20:19

Vytenis Bivainis

3 Answers3