flipdiff Man page



flipdiff – exchange the order of two incremental patches


flipdiff [[-p n] | [–strip-match=n]] [[-U n] | [–unified=n]] [[-d PAT] | [–drop-context=PAT]] [[-q] | [–quiet]] [[-z] |
[–decompress]] [[-b] | [–ignore-space-change]] [[-B] |
[–ignore-blank-lines]] [[-i] | [–ignore-case]] [[-w] |
[–ignore-all-space]] [–in-place] diff1 diff2

flipdiff {[–help] | [–version]}


flipdiff exchanges the order of two patch files that apply one after
the other. The patches must be “clean”: the context lines must match
and there should be no mis-matched offsets.

The swapped patches are sent to standard output, with a marker line
(“=== 8< === cut here === 8< ===”) between them, unless the --in-place option is passed. In that case, the output is written back to the original input files.


-p n, –strip-match=n
When comparing filenames, ignore the first n pathname components
from both patches. (This is similar to the -p option to GNU

-q, –quiet
Quieter output. Don’t emit rationale lines at the beginning of each

-U n, –unified=n
Attempt to display n lines of context (requires at least n lines of
context in both input files). (This is similar to the -U option to
GNU diff.)

-d pattern, –drop-context=PATTERN
Don’t display any context on files that match the shell wildcard
pattern. This option can be given multiple times.

Note that the interpretation of the shell wildcard pattern does not
count slash characters or periods as special (in other words, no
flags are given to fnmatch). This is so that “*/basename”-type
patterns can be given without limiting the number of pathname

-i, –ignore-case
Consider upper- and lower-case to be the same.

-w, –ignore-all-space
Ignore whitespace changes in patches.

-b, –ignore-space-change
Ignore changes in the amount of whitespace.

-B, –ignore-blank-lines
Ignore changes whose lines are all blank.

-z, –decompress
Decompress files with extensions .gz and .bz2.

Write output to the original input files.

Display a short usage message.

Display the version number of flipdiff.

This is only been very lightly tested, and may not even work. Using
–in-place is not recommended at the moment.

There are some cases in which it is not possible to meaningfully flip
patches without understanding the semantics of the content. This
program only uses complete lines that appear at some stage during the
application of the two patches, and never composes a line from parts.

Because of this, it is generally a good idea to read through the output
to check that it makes sense.


Tim Waugh
Package maintainer

patchutils 23 January 2009 FLIPDIFF(1)

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