.bag.active file creating

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But in the terminal it shows as process has finished cleanly. At starting itself it shows as .bag.active

Without analyzing your system it would be hard to understand why it's happening. Does the above command fix it though?

Does the single line code above mentioned is enough to record data? Anything else has to be written??

Just replace <name> With your actual bag file name. This one line should be enough

After reindexing i got a file as .bag.orig.active. How can I open it? Does the problem solved?

It creates a copy of the original bag as .orig. there should also be a reindexed file as .bag.

If that didn’t work, you can also try

rosbag fix .bag.active fixed.bag

After reindexing there are only two files. The .bag.active file and .bag.orig.active file. I have done rosbag fix. Then I got a repaired.bag file.