find difference between two text files with one item per line [duplicate]

Question

I have two files:

file 1

dsf sdfsd dsfsdf 

file 2

ljljlj  lkklk  dsf sdfsd dsfsdf 

I want to display what is in file 2 but not in file 1, so file 3 should look like

ljljlj  lkklk  

Answer 1

grep -Fxvf file1 file2 

What the flags mean:

-F, --fixed-strings               Interpret PATTERN as a list of fixed strings, separated by newlines, any of which is to be matched.     -x, --line-regexp               Select only those matches that exactly match the whole line. -v, --invert-match               Invert the sense of matching, to select non-matching lines. -f FILE, --file=FILE               Obtain patterns from FILE, one per line.  The empty file contains zero patterns, and therefore matches nothing. 

Answer 2

You can try

grep -f file1 file2 

or

grep -v -F -x -f file1 file2