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/usr/share/gazebo-9/worlds/simple_gripper.world is in gazebo9-common 9.0.0+dfsg5-3ubuntu1.

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The actual contents of the file can be viewed below.

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<?xml version="1.0" ?>
<sdf version="1.5">
  <world name="default">
    <!-- A global light source -->
    <include>
      <uri>model://sun</uri>
    </include>
    <!-- A ground plane -->
    <include>
      <uri>model://ground_plane</uri>
    </include>

    <include>
      <uri>model://simple_arm</uri>
    </include>
    <model name="cylinder">
      <pose>1.0 1.0 0 0 0 0</pose>
      <link name="base">
        <visual name="cylinder_visual">
          <geometry>
            <cylinder>
              <radius>0.15</radius>
              <length>0.25</length>
            </cylinder>
          </geometry>
        </visual>
        <collision name="cylinder_collision">
          <geometry>
            <cylinder>
              <radius>0.15</radius>
              <length>0.25</length>
            </cylinder>
          </geometry>
        </collision>
      </link>
    </model>
    <include>
      <pose>0.35 0.35 0.5 0 0 0.7071</pose>
      <uri>model://camera</uri>
    </include>

    <include>
      <pose>0.45 0.45 0.3 0 0 0.7071</pose>
      <uri>model://hokuyo</uri>
    </include>
  </world>
</sdf>