cmptree Compare directory trees recursively and report the differences. (what)
Path    : ~/bin/cmptree
Length  : 183 lines
Type    : Bourne-Again shell script, ASCII text executable
Shebang : #!/bin/bash

Difference, similarity, compare

        1) diff, standard

        2) cmp, standard

        3) dwdiff, cdif (local), word differences

        4) cmptree (local), dirdiff (GUI), compare directory trees
           http://www.drdobbs.com/the-shell-corner-cmptree/199103123 (2016.11)

        5) docdiff, compare by character, word, line, numerous output formats

        6) meld (GUI), diff and merge files

        7) numdiff, my-ndiff (local), snd (local), compare numerically

        8) comm, standard, compare 2 sorted files, 3 column output

        9) comm-split (local), compare like comm, but split output to
           separate files.

        10) multi-comm (local), compare n files, need not be sorted

        11) contrast (local), like comm, needs no sort, symmetric and
        simple differences, intersection, union

        12) diff.pl, perl work-alike for diff
            https://metacpan.org/pod/distribution/PerlPowerTools/bin/diff

        13) multi-diff (local), common lines, multiple files, re-write omitting common lines

        14) psame (local), find similarity between 2 text files

        15) fdupes, rdfind, duff, find duplicate files

        16) dateutils.ddiff, find difference in dates, times

OS, ker|rel, machine: Linux, 3.16.0-4-amd64, x86_64
Distribution        : Debian 8.6 (jessie)