[ros-users] How to get command api decompress of rosbag?

I have installed ros following the ros document.
Now I have a bag file needed to parse. Since it is said that the decompress
command of rosbag package can get topic information from bag, so I install
the rosbag package, but no decompress command found.
Maybe my ros isn't the newest. Does anyone know the reason? And what should
I do? Thank you.
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