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I have two files with contents of some words.

Example

file1 it has 10 words:

world
earth
eye
ear
near 
from 
going
want
we 
our

Second file2 has 7 words:

world
earth
eye
ear
near 
going
want

I want output as third file for the words which does not exist in file2.

for example (from , our , we) does not exist in file2.

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  • Can you give example of desired output? Oct 30, 2017 at 7:35

2 Answers 2

3

Just do

grep -vFxf file2 file1 > file3

This will return those lines that doesn't exist in file2 but in file1 and write the result to file3.

  • -v, reverse match, here means those lines if exist only in file2. Without -v it will return those lines which are exist in both files.

  • -F, this is telling grep to match the pattern as a fixed pattern string instead of regex (regular expressions)

  • -x, matches the whole line as pattern string

  • -f, reading the patterns from a file

Or per your question's title and the command you referred to that sort -u, seems you want those unique words (actually lines) either exist in the file1 or file2. then you just need.

uniq -u <(sort file1 file2) > file3
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  • 1
    If you wanted the lines that are unique in file1 and file2, that would be sort file1 file2 | uniq -u. Note that using -w here only does what you want/say if there's only one word per line (and no non-word character), so you might as well use -x instead of -w. Oct 30, 2017 at 8:23
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Another solution:

comm -23 <(sort file1) <(sort file2) > file3

The -23 will suppress the rows contained in either only file2 or in both files.

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