Chasing a Turtle by Another Turtle using ROS Turtlesim package
cd ~
mkdir -p catkin_ws/src
cd catkin_ws/src
git clone git@github.com:hhojatansari/theif_police.git
cd ..
catkin_make
if using bash:
source ~/catkin_ws/devel/setup.bash
if using zsh:
source ~/catkin_ws/devel/setup.zsh
roslaunch theif_police theif_police.launch
rosrun turtlesim turtle_teleop_key /turtle1/cmd_vel:=/theif/cmd_vel
this package Used from this tutorial