(diff.info) Dry Runs
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Predicting what `patch' will do
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It may not be obvious in advance what `patch' will do with a
complicated or poorly formatted patch. If you are concerned that the
input might cause `patch' to modify the wrong files, you can use the
`--dry-run' option, which causes `patch' to print the results of
applying patches without actually changing any files. You can then
inspect the diagnostics generated by the dry run to see whether `patch'
will modify the files that you expect. If the patch does not do what
you want, you can modify the patch (or the other options to `patch')
and try another dry run. Once you are satisfied with the proposed
patch you can apply it by invoking `patch' as before, but this time
without the `--dry-run' option.
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