GNU(1)                   (December 2018)                   GNU(1)

          GNU diff - compare files line by line

          diff [OPTION]... FILES

          Compare FILES line by line.

          Mandatory arguments to long options are mandatory for short
          options too.

               output a normal diff (the default)

          -q, --brief
               report only when files differ

          -s, --report-identical-files
               report when two files are the same

          -c, -C NUM, --context[=NUM]
               output NUM (default 3) lines of copied context

          -u, -U NUM, --unified[=NUM]
               output NUM (default 3) lines of unified context

          -e, --ed
               output an ed script

          -n, --rcs
               output an RCS format diff

          -y, --side-by-side
               output in two columns

          -W, --width=NUM
               output at most NUM (default 130) print columns

               output only the left column of common lines

               do not output common lines

          -p, --show-c-function
               show which C function each change is in

          -F, --show-function-line=RE
               show the most recent line matching RE

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          --label LABEL
               use LABEL instead of file name and timestamp (can be

          -t, --expand-tabs
               expand tabs to spaces in output

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

               tab stops every NUM (default 8) print columns

               suppress space or tab before empty output lines

          -l, --paginate
               pass output through 'pr' to paginate it

          -r, --recursive
               recursively compare any subdirectories found

               don't follow symbolic links

          -N, --new-file
               treat absent files as empty

               treat absent first files as empty

               ignore case when comparing file names

               consider case when comparing file names

          -x, --exclude=PAT
               exclude files that match PAT

          -X, --exclude-from=FILE
               exclude files that match any pattern in FILE

          -S, --starting-file=FILE
               start with FILE when comparing directories

               compare FILE1 to all operands; FILE1 can be a directory

               compare all operands to FILE2; FILE2 can be a directory

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          -i, --ignore-case
               ignore case differences in file contents

          -E, --ignore-tab-expansion
               ignore changes due to tab expansion

          -Z, --ignore-trailing-space
               ignore white space at line end

          -b, --ignore-space-change
               ignore changes in the amount of white space

          -w, --ignore-all-space
               ignore all white space

          -B, --ignore-blank-lines
               ignore changes where lines are all blank

          -I, --ignore-matching-lines=RE
               ignore changes where all lines match RE

          -a, --text
               treat all files as text

               strip trailing carriage return on input

          -D, --ifdef=NAME
               output merged file with '#ifdef NAME' diffs

               format GTYPE input groups with GFMT

               format all input lines with LFMT

               format LTYPE input lines with LFMT

               These format options provide fine-grained control over
               the output

               of diff, generalizing -D/--ifdef.

          LTYPE is 'old', 'new', or 'unchanged'.
               GTYPE is LTYPE or 'changed'.

               GFMT (only) may contain:

          %<   lines from FILE1

          %>   lines from FILE2

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          %=   lines common to FILE1 and FILE2

               printf-style spec for LETTER

               LETTERs are as follows for new group, lower case for
               old group:

          F    first line number

          L    last line number

          N    number of lines = L-F+1

          E    F-1

          M    L+1

               if A equals B then T else E

               LFMT (only) may contain:

          %L   contents of line

          %l   contents of line, excluding any trailing newline

               printf-style spec for input line number

               Both GFMT and LFMT may contain:

          %%   %

               the single character C

               the character with octal code OOO

          C    the character C (other characters represent themselves)

          -d, --minimal
               try hard to find a smaller set of changes

               keep NUM lines of the common prefix and suffix

               assume large files and many scattered small changes


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               colorize the output; WHEN can be 'never', 'always', or
               'auto' (the default)

               the colors to use when --color is active; PALETTE is a
               colon-separated list of terminfo capabilities

               display this help and exit

          -v, --version
               output version information and exit

          FILES are 'FILE1 FILE2' or 'DIR1 DIR2' or 'DIR FILE' or
          'FILE DIR'.  If --from-file or --to-file is given, there are
          no restrictions on FILE(s).  If a FILE is '-', read standard
          input.  Exit status is 0 if inputs are the same, 1 if dif-
          ferent, 2 if trouble.

          Written by Paul Eggert, Mike Haertel, David Hayes, Richard
          Stallman, and Len Tower.

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

          Copyright c 2018 Free Software Foundation, Inc.  License
          GPLv3+: GNU GPL version 3 or later
          This is free software: you are free to change and redis-
          tribute it.  There is NO WARRANTY, to the extent permitted
          by law.

          wdiff(1), cmp(1), diff3(1), sdiff(1), patch(1)

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

               info GNU

          should give you access to the complete manual.

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