What is the difference between Copied context output format and Unified context output format when taking a diff?
diff -NBur dir1/ dir2/ diff -NBcr dir1/ dir2/
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Apparently you've misread the manual. The
-u flag is for unified context, not Unicode and
-c is for copied context, not 'Context format':
-c -C NUM --context[=NUM]
Output NUM (default 3) lines of copied context.
-u -U NUM --unified[=NUM]
Output NUM (default 3) lines of unified context.
The most straightforward way to find out what is the difference, is to try it out:
$ cat >1 line diff more ^D $ cat >2 line ffid more ^D
$ diff -c 1 2 *** 1 2010-12-14 09:08:48.019797000 +0200 --- 2 2010-12-14 09:08:56.029797001 +0200 *************** *** 1,3 **** line ! diff more --- 1,3 ---- line ! ffid more
$ diff -u 1 2 --- 1 2010-12-14 09:08:48.019797000 +0200 +++ 2 2010-12-14 09:08:56.029797001 +0200 @@ -1,3 +1,3 @@ line -diff +ffid more
Do you get what's the difference?