Extract size info from ros2 bag in shell script

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In ROS1, one can use 'rosbag info -y -k size bagName' to get the bag size information. How can I do it in ROS2 with Shell Script? Thank you in advance!

"ros2 bag info -h" does not have -y -k choices. I do not want to install ROS1 to my PC. I hope all the commands are limited in ROS2.

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Sux On

ros2 bags are just folder so you can use "du -hs folder_name/" to see the amount of space it uses