Comparing two unsorted lists in linux, listing the unique in the second file
grep -Fxv -f first-file.txt second-file.txtBasically looks for all lines in second-file.txt which don't match any line in first-file.txt. Might be slow if the files are large.
Also, once you sort the files (Use sort -n if they are numeric), then comm should also have worked. What error does it give? Try this:
comm -23 second-file-sorted.txt first-file-sorted.txt
You need to use comm:
comm -13 first.txt second.txtwill do the job.
ps. order of first and second file in command line matters.
also you may need to sort files before:
comm -13 <(sort first.txt) <(sort second.txt)in case files are numerical add -n option to sort.
This should work
comm -13 <(sort file1) <(sort file2)It seems sort -n (numeric) cannot work with comm, which uses sort (alphanumeric) internally
f1.txt
122150f2.txt
13215021 should appear in third column
#WRONG$ comm <(sort -n f1.txt) <(sort -n f2.txt) 1221 3 21 50#OK$ comm <(sort f1.txt) <(sort f2.txt) 12 21 3 50