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           diff [OPTION]... FILES


           Compare files line by line.
           -i  --ignore-case
                  Ignore case differences in file contents.
                  Ignore case when comparing file names.
                  Consider case when comparing file names.
           -E  --ignore-tab-expansion
                  Ignore changes due to tab expansion.
           -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 whose lines are all blank.
           -I RE  --ignore-matching-lines=RE
                  Ignore changes whose lines all match RE.
                  Strip trailing carriage return on input.
           -a  --text
                  Treat all files as text.
           -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.
           --label LABEL
                  Use LABEL instead of file name.
           -p  --show-c-function
                  Show which C function each change is in.
           -F RE  --show-function-line=RE
                  Show the most recent line matching RE.
           -q  --brief
           -W NUM  --width=NUM
                  Output at most NUM (default 130) print columns.
                  Output only the left column of common lines.
                  Do not output common lines.
           -D NAME  --ifdef=NAME
                  Output merged file to show '#ifdef NAME' diffs.
                  Similar, but format GTYPE input groups with GFMT.
                  Similar, but format all input lines with LFMT.
                  Similar, but format LTYPE input lines with LFMT.
           LTYPE is 'old', 'new', or 'unchanged'.
                  GTYPE is LTYPE or 'changed'.
                  GFMT may contain:
           %<     lines from FILE1
           %>     lines from FILE2
           %=     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
                  LFMT may contain:
           %L     contents of line
           %l     contents of line, excluding any trailing newline
                  Pass the output through 'pr' to paginate it.
           -t  --expand-tabs
                  Expand tabs to spaces in output.
           -T  --initial-tab
                  Make tabs line up by prepending a tab.
           -r  --recursive
                  Recursively compare any subdirectories found.
           -N  --new-file
                  Treat absent files as empty.
                  Treat absent first files as empty.
           -s  --report-identical-files
                  Report when two files are the same.
           -x PAT  --exclude=PAT
                  Exclude files that match PAT.
           -X FILE  --exclude-from=FILE
                  Exclude files that match any pattern in FILE.
           -S FILE  --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.
                  Keep NUM lines of the common prefix and suffix.
           -d  --minimal
                  Try hard to find a smaller set of changes.
                  Assume large files and many scattered small changes.
           -v  --version
                  Output version info.
           --help Output this help.
           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 FILES.  If a FILE is '-', read standard input.
           the file named COPYING.


           The  full documentation for diff is maintained as a Texinfo manual.  If
           the info and diff programs are properly installed  at  your  site,  the
                  info diff
           should give you access to the complete manual.

    diffutils 2.8.1 November 2010 DIFF(1)


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