-o FILE --output=FILE Operate interactively, sending output to FILE.
-i --ignore-case Consider upper- and lower-case to be the same.
-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-cr Strip trailing carriage return on input.
-a --text Treat all files as text.
-w NUM --width=NUM Output at most NUM (default 130) print columns.
-l --left-column Output only the left column of common lines.
-s --suppress-common-lines Do not output common lines.
-t --expand-tabs Expand tabs to spaces in output.
--tabsize=NUM Tab stops are every NUM (default 8) print columns.
-d --minimal Try hard to find a smaller set of changes.
-H --speed-large-files Assume large files and many scattered small changes.
--diff-program=PROGRAM Use PROGRAM to compare files.
-v --version Output version info.
--help Output this help.
If a FILE is `-', read standard input. Exit status is 0 if inputs are the same, 1 if different, 2 if trouble.
This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
should give you access to the complete manual.