/usr/share/qgis/grass/modules/v.db.join.qgm is in qgis-plugin-grass-common 2.0.1-2build2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 | <?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE qgisgrassmodule SYSTEM "http://mrcc.com/qgisgrassmodule.dtd">
<qgisgrassmodule label="Join table to existing vector table" module="v.db.join">
<option key="map" layeroption="layer" />
<field key="column" layer="map" type="integer,string" label="Attribute field" />
<option key="otable"/>
<option key="ocolumn" label="Attribute field to join" />
</qgisgrassmodule>
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