diff options
------------

   These standard options are supported by `diff' (*note Common
options::., for a complete description of them):

`-D DATE'
     Use the most recent revision no later than DATE.  See `-r' for how
     this affects the comparison.

`-k KFLAG'
     Process RCS keywords according to KFLAG.  See co(1).

`-l'
     Local; run only in current working directory.

`-R'
     Examine directories recursively.  This option is on by default.

`-r TAG'
     Compare with revision TAG.  Zero, one or two `-r' options can be
     present.  With no `-r' option, the working file will be compared
     with the revision it was based on.  With one `-r', that revision
     will be compared to your current working file.  With two `-r'
     options those two revisions will be compared (and your working
     file will not affect the outcome in any way).

     One or both `-r' options can be replaced by a `-D DATE' option,
     described above.

`--ifdef=ARG'
     Output in ifdef format.  Consult the documentation of your
     underlying diff program concerning the `-D' option to diff, for
     more information on this format.

   The following options are passed through to `rcsdiff', which in turn
passes them to `diff'.  The exact meaning of the options depends on
which `diff' you are using.  See the documentation for your `diff' for
details.

   `-a' `-b' `-B' `-c' `-C' NLINES `-d' `-e' `-f' `-h' `-H' `-i' `-n'
`-N' `-p' `-s' `-t' `-u' `-U' NLINES `-F' REGEXP `-I' REGEXP `-L' LABEL
`-T' `-V' ARG `-W' COLUMNS `-w' `-y' `-0' `-1' `-2' `-3' `-4' `-5' `-6'
`-7' `-8' `-9' `--binary' `--brief' `--changed-group-format=ARG'
`--context[=LINES]' `--ed' `--expand-tabs' `--forward-ed'
`--horizon-lines=ARG' `--ignore-all-space' `--ignore-blank-lines'
`--ignore-case' `--ignore-matching-lines=REGEXP'
`--ignore-space-change' `--initial-tab' `--label=LABEL' `--left-column'
`--minimal' `--new-file' `--new-line-format=ARG'
`--old-line-format=ARG' `--paginate' `--rcs' `--report-identical-files'
`--code-c-function' `--side-by-side' `--show-function-line=REGEXP'
`--speed-large-files' `--suppress-common-lines' `--text'
`--unchanged-group-format=ARG' `--unified[=LINES]' `--width=COLUMNS'