man: Document the db --diff option
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</para>
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</para>
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<para>
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<para>
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<command>diff</command> to see how the packages are different between the trees in two commits.
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<command>diff</command> to see how the packages are
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different between the trees in two commits. The
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<option>--format=diff</option> option uses
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<literal>-<literal> for removed packages,
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<literal>+</literal> for added packages, and finally
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<literal>!</literal> for the old version of an updated
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package, with a following <literal>=</literal> for the new
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version.
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</para>
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</para>
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<para>
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<para>
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