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(diff.info)Alternate Names

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Showing Alternate File Names
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   If you are comparing two files that have meaningless or uninformative
names, you might want `diff' to show alternate names in the header of
the context and unified output formats.  To do this, use the `-L LABEL'
or `--label=LABEL' option.  The first time you give this option, its
argument replaces the name and date of the first file in the header;
the second time, its argument replaces the name and date of the second
file.  If you give this option more than twice, `diff' reports an
error.  The `-L' option does not affect the file names in the `pr'
header when the `-l' or `--paginate' option is used (Note:
Pagination).

   Here are the first two lines of the output from `diff -C2 -Loriginal
-Lmodified lao tzu':

     *** original
     --- modified