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Recreating a file from diff

How do I create a source file from diff, I have one of the files and the other is unknowingly. Is there any tool to convert the diff output to 'ed' diff format (diff -e output) or pattern output format?

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3 answers


If you have:

  • old file and
  • diff

then it's just a matter of applying diff in the usual way:

patch the_file <the_diff

This is a common use case for diff.



If you have:

  • new file and
  • diff

then you can simply apply the patch in reverse order with the option patch

-R

:

patch -R the_file <the_diff
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This is exactly what it is patch

for!



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Yes, use patch

to apply diff to one of the source files.

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