how to show lines in common reverse diff

Question

I have a series of text files for which I d like to know the lines in common rather than the lines which are different between them  Command line unix or windows is fine   foo   linux-vdso so 1   gt    0x00007fffccffe000  libvlc so 2   gt   usr lib libvlc so 2  0x00007f0dc4b0b000  libvlccore so 0   gt   usr lib libvlccore so 0  0x00007f0dc483f000  libc so 6   gt   lib libc so 6  0x00007f0dc44cd000    bar   libkdeui so 5   gt   usr lib libkdeui so 5  0x00007f716ae22000  libkio so 5   gt   usr lib libkio so 5  0x00007f716a96d000  linux-vdso so 1   gt    0x00007fffccffe000    So  given these two files above the output of the desired utility would be akin to file1 line number  file2 line number    matching text   just a suggestion  I really don t care what the syntax is    foo 1  bar 3    linux-vdso so 1   gt    0x00007fffccffe000    thanks

User · Answer

In Windows you can use a Powershell Script with CompareObject  compare-object -IncludeEqual -ExcludeDifferent -PassThru  get-content A txt   get-content B txt  gt  MATCHING txt   Out-Null  Find Matching Lines   CompareObject    IncludeEqual without -ExcludeDifferent   Everything ExcludeDifferent without -InclueEqual   Nothing

User · Answer

I just learned the comm command from this thread  but wanted to add something extra  if the files are not sorted  and you don t want to touch the original files  you can pipe the outptut of the sort command   This leaves the original files intact   Works in bash  I can t say about other shells   comm -1 -2  lt  sort file1   lt  sort file2    This can be extended to compare command output  instead of files   comm -1 -2  lt  ls  dir1   sort   lt  ls  dir2   sort

User · Answer

Just for information  i made a little tool for Windows doing the same thing than  grep -F -x -f file1 file2   As i haven t found anything equivalent to this command on Windows   Here it is   http   www nerdzcore com  page commonlines  Usage is  CommonLines inputFile1 inputFile2 outputFile   Source code is also available  GPL

User · Answer

Was asked here before  Unix command to find lines common in two files  You could also try with perl  credit goes here    perl -ne  print if   seen         ARGV      10     file1 file2

User · Answer

Found this answer on a question listed as a duplicate  I find grep to be more admin-friendly than comm  so if you just want the set of matching lines  useful for comparing CSVs  for instance  simply use  grep -F -x -f file1 file2   or the simplified fgrep version  fgrep -xf file1 file2   Plus  you can use file2  to glob and look for lines in common with multiple files  rather than just two   Some other handy variations include   -n flag to show the line number of each matched line -c to only count the number of lines that match -v to display only the lines in file2 that differ  or use diff     Using comm is faster  but that speed comes at the expense of having to sort your files first  It isn t very useful as a  reverse diff

User · Answer

Easiest way to do is    awk  NR  FNR a  1    next  a  1    file1 file2   Files are not necessary to be sorted

User · Answer

On  nix  you can use comm   The answer to the question is   comm -1 -2 file1 sorted file2 sorted    where file1 and file2 are sorted and piped into   sorted   Here s the full usage of comm   comm  -1   -2   -3   file1 file2 -1 Suppress the output column of lines unique to file1  -2 Suppress the output column of lines unique to file2  -3 Suppress the output column of lines duplicated in file1 and file2     Also note that it is important to sort the files before using comm  as mentioned in the man pages

[command-line] how to show lines in common (reverse diff)?

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