Hi everybody

I'm trying to use diff to find the differences between two files and show the section of the file where the difference occurred. Diff allows you to use a regular expression to mark the last section header before the difference with the -F flag. That's all fine.

My problem is is that only the first 40 characters of the section lines are shown. Most of my section headers are longer than that (100 characters+) and I would like to be able to see it all, especially since some sections begin the same.

Input:
diff -F [[] -u file1 file2
Output:
@@ -1, 1 +1, 1 @@ [FILE1-CHAPTER-1-SECTION-1-HEADER-MORE-T

The full line should read [FILE1-CHAPTER-1-SECTION-1-HEADER-MORE- THAN-FORTY-CHARACTERS. The line is just an example, the actual headers are more meaningful and cant be reduced to less than 40 chars.

The diff manual says I can use more than one regex for such lines. Can anybody give me an example... Or suggestions... Thanks