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Input options:






-p NUM  --strip=NUM      Strip NUM leading components from file names.






-F LINES  --fuzz LINES   Set the fuzz factor to LINES for inexact



                         matching.






-l  --ignore-whitespace  Ignore white space changes between patch



                         and input.






-c  --context            Interpret the patch as a context difference.






-e  --ed                 Interpret the patch as an ed script.






-n  --normal             Interpret the patch as a normal difference.






-u  --unified            Interpret the patch as a unified difference.






-N  --forward            Ignore patches that appear to be reversed



                         or already applied.






-R  --reverse            Assume patches were created with old and new



                         files swapped.






-i PATCHFILE  --input=PATCHFILE  Read patch from PATCHFILE instead



                                 of stdin.






Output options:






-o FILE  --output=FILE       Output patched files to FILE.






-r FILE  --reject-file=FILE  Output rejects to FILE.






-D NAME  --ifdef=NAME        Make merged if-then-else output using



                             NAME.






-E  --remove-empty-files     Remove output files that are empty after



                             patching.






-Z  --set-utc                Set times of patched files, assuming diff



                             uses UTC (GMT).






-T  --set-time               Likewise, assuming local time.






--quoting-style=WORD         output file names using quoting style



                             WORD.






    Valid WORDs are: literal, shell, shell-always, c, escape.



    Default is taken from QUOTING_STYLE env variable, or 'shell'



    if unset.






Backup and version control options:






-b  --backup          Back up the original contents of each file.






--backup-if-mismatch  Back up if the patch does not match exactly.






--no-backup-if-mismatch  Back up mismatches only if otherwise



                         requested.






-V STYLE  --version-control=STYLE  Use STYLE version control.



                                   STYLE is either 'simple', 'numbered',



                                   or 'existing'.






-B PREFIX  --prefix=PREFIX    Prepend PREFIX to backup file names.






-Y PREFIX  --basename-prefix=PREFIX  Prepend PREFIX to backup file



                                     basenames.






-z SUFFIX  --suffix=SUFFIX  Append SUFFIX to backup file names.






-g NUM  --get=NUM  Get files from RCS etc. if positive; ask if



                   negative.






Miscellaneous options:






-t  --batch  Ask no questions; skip bad-Prereq patches; assume



             reversed.






-f  --force  Like -t, but ignore bad-Prereq patches, and assume



                      unreversed.






-s  --quiet  --silent Work silently unless an error occurs.






--verbose    Output extra information about the work being done.






--dry-run    Do not actually change any files; just print what



             would happen.






--posix  Conform to the POSIX standard.






-U  --unified-reject-files  Create unified reject files.






--global-reject-file=file  Put all rejects into one file.






-d DIR  --directory=DIR  Change the working directory to DIR first.






--binary  Read and write data in binary mode



          (no effect on this platform).






-v  --version  Output version info.






--help  Output this help.