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we are going to learn today the basics of ROS
so open up your terminal and uh here we have

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already installed  the ROS but let me check ROS2
topic list ROS2 command not found so this system

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does not know where the ROS2 actually is so we
will have to Source out terminal in order to let

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the system know that here is the ROS type source opt
ROS foxy setup dot bash okay so now I

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will try the same command again this time it
gives me topics but for if I open up another

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terminal and type ros2 topic list oh again
the command not found so if we have to use the ROS we

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will have to source the ROS setup first but
in order to avoid it we can do one more thing

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echo source opt Ros foxy setup dot bash

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bashrc it will insert this line into
the bashrc just close this terminal and

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open a new terminal ros2 topic  list now
we have the topics no we do not need to

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source ROS2 every time in a new
terminal you can also do it manually you

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can go to the file press control H or show
the hidden file uh there you go bashrc and

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in the end you will see this is added you can
simply close it press contrl h so in order to

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check your verion of ros and the ros distro you can
choose a Command this is the Command where you can

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check the Ross variable distro and the
version here you can see the ROS version is two

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python version is three and a bunch of
other detail that you do not need to

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know right now that was the all about environment

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setup