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The rosbag wiki has the information. Assuming your pen drive is at /mnt/pen
you can use either the -o
or -O
flag:
rosbag record -o /mnt/pen/ /chatter
rosbag record -O /mnt/pen/test.bag /chatter
The first case with lower-case -o
will output a bag file with the timestamp at the location you specify. The second case with upper-case -O
will output a bag file simply named test.bag
at the location you specify (_without_ the timestamp on the filename).