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I tried it on my machine. On ROS Melodic, the current autocompletion behaviour of rosbag record and other subcommands of rosbag is to insert a file name, so when you press the tab key, the computer inserts the name of the only file in the current directory or shows you a list of the files in the directory if you have more than one file. Nothing will be inserted if you don't have any file in the current directory.