/usr/share/rosgraph_msgs/msg/Clock.msg is in ros-rosgraph-msgs 1.11.2-5.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 | # roslib/Clock is used for publishing simulated time in ROS.
# This message simply communicates the current time.
# For more information, see http://www.ros.org/wiki/Clock
time clock
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