Run Vdump from bash script no password and have it close after preset amount of time

[Rotoslider]

I would like a way to capture 1 pcap file from my velodyne vlp-16 after running for 6 minutes. Currently I have a desktop icon that I double click. rosrun velodyne_driver vdump pcap- eth0 It prompts for a password. I would like to not have to type the password since its a portable rig and not easy to type on. I also need to hit Control C to close. I would like it to shut down and close the terminal after 6 minutes with no interaction. Is there a way to do this? Last item is to be able to append the time stamp into the filename.

thanks in advance

[Rotoslider]

I figured out how to add the date to the base name. And how to make it run for x number of seconds. If you add date +%y_%m_%d_%H_%M after the base name it will put a time stamp in the filename. I took out seconds since I did not need them. Adding -G 360 to the script in vdump will make it run for 360 seconds. But if -C is small it will still split files to the size of the value in -C I have not found a good way to run without sudo I can shutdown the terminal after a set time with pkill. If I kill it too quick it messes up the file save. I'm sure there is a better way but not sure yet. Also i I wait a while it seems like the value of the filesize changes like its still recording to the file. I know -G is a loop record time but if I set -W to 1 I would think it would stop but I guess its still looping.