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I would suggest that you remove any line like:

export ROS_HOSTNAME from your .bashrc and create a new shell. Else you would have to call unset every time you create a new shell.

I would suggest that you remove any line like:

export ROS_HOSTNAME ROS_HOSTNAME

from your .bashrc and create a new shell. Else you would have to call unset every time you create a new shell. shell.

I would suggest that you remove any line like:

export ROS_HOSTNAME
ROS_HOSTNAME=...

from your .bashrc and create a new shell. Else you would have to call unset every time you create a new shell.