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#### Showing Alternate File Names

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 `--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 `--label` option does not affect the file names in the `pr` header when the `-l` or `--paginate` option is used.

Here are the first two lines of the output from `diff -C 2 --label=original --label=modified lao tzu`:

    *** original
    --- modified