(diff.info.gz) Ignoring Changes

 
 Ignoring Certain Changes
 ------------------------
 
    It would be nice to have a feature for specifying two strings, one in
 FROM-FILE and one in TO-FILE, which should be considered to match.
 Thus, if the two strings are `foo' and `bar', then if two lines differ
 only in that `foo' in file 1 corresponds to `bar' in file 2, the lines
 are treated as identical.
 
    It is not clear how general this feature can or should be, or what
 syntax should be used for it.
 
    A partial substitute is to filter one or both files before comparing,
 e.g.:
 
      sed 's/foo/bar/g' file1 | diff - file2
 
    However, this outputs the filtered text, not the original.

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