DIFF3(1)                        User Commands                       DIFF3(1)

NAME         top

       diff3 - compare three files line by line

SYNOPSIS         top


DESCRIPTION         top

       Compare three files line by line.

       Mandatory arguments to long options are mandatory for short options

       -A, --show-all
              output all changes, bracketing conflicts

       -e, --ed
              output ed script incorporating changes from OLDFILE to
              YOURFILE into MYFILE

       -E, --show-overlap
              like -e, but bracket conflicts

       -3, --easy-only
              like -e, but incorporate only nonoverlapping changes

       -x, --overlap-only
              like -e, but incorporate only overlapping changes

       -X     like -x, but bracket conflicts

       -i     append 'w' and 'q' commands to ed scripts

       -m, --merge
              output actual merged file, according to -A if no other options
              are given

       -a, --text
              treat all files as text

              strip trailing carriage return on input

       -T, --initial-tab
              make tabs line up by prepending a tab

              use PROGRAM to compare files

       -L, --label=LABEL
              use LABEL instead of file name (can be repeated up to three

       --help display this help and exit

       -v, --version
              output version information and exit

       The default output format is a somewhat human-readable representation
       of the changes.

       The -e, -E, -x, -X (and corresponding long) options cause an ed
       script to be output instead of the default.

       Finally, the -m (--merge) option causes diff3 to do the merge
       internally and output the actual merged file.  For unusual input,
       this is more robust than using ed.

       If a FILE is '-', read standard input.  Exit status is 0 if
       successful, 1 if conflicts, 2 if trouble.

AUTHOR         top

       Written by Randy Smith.

REPORTING BUGS         top

       Report bugs to:
       GNU diffutils home page: <>
       General help using GNU software: <>

COPYRIGHT         top

       Copyright © 2015 Free Software Foundation, Inc.  License GPLv3+: GNU
       GPL version 3 or later <>.
       This is free software: you are free to change and redistribute it.
       There is NO WARRANTY, to the extent permitted by law.

SEE ALSO         top

       cmp(1), diff(1), sdiff(1)

       The full documentation for diff3 is maintained as a Texinfo manual.
       If the info and diff3 programs are properly installed at your site,
       the command

              info diff3

       should give you access to the complete manual.

COLOPHON         top

       This page is part of the diffutils (GNU diff utilities) project.
       Information about the project can be found at 
       ⟨⟩.  If you have a bug
       report for this manual page, send it to  This
       page was obtained from the project's upstream Git repository 
       ⟨git://⟩ on 2017-03-13.  If you dis‐
       cover any rendering problems in this HTML version of the page, or you
       believe there is a better or more up-to-date source for the page, or
       you have corrections or improvements to the information in this
       COLOPHON (which is not part of the original manual page), send a mail

diffutils 3.5.17-198c-dirty     February 2017                       DIFF3(1)