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Have a look at this tutorial.

You could also use:

export ROS_NAMESPACE=/ajsim
rosrun turtlesim turtle_teleop_key

This would run the teleop node under the ajsim namespace, and would allow you to subscribe to the topic.

Have a look at this tutorial.

You could also use:

export ROS_NAMESPACE=/ajsim
rosrun turtlesim turtle_teleop_key

This would run the teleop node under the ajsim namespace, and would allow you to subscribe to the topic.

EDIT:

I do not know of a way to change a node's namespace while it's running. If you don't want to use the ROS_NAMESPACE variable, then you would want to use roslaunch.