[ros-users] Introduction To ROS

Patrick Goebel patrick at pirobot.org
Sun Feb 13 14:54:11 UTC 2011

Hi Jason,

Yes, ROS is mostly command line based via the terminal application. 
This will become more familiar as you work through the tutorials.  It 
sounds like the ROS bin directory is not in your PATH environment 
variable.  Assuming you have installed C-turtle on Ubuntu Linux, when 
you execute the command:

printenv PATH

you should see


as part of the output.  Also, when you say you went though the 
environmental setup portion, double check that you have run the 
following commands:

echo "source /opt/ros/cturtle/setup.bash" >> ~/.bashrc
. ~/.bashrc

Note the . at the beginning of that second command.  Then make sure you 
run the second command in any open terminal windows (or simply close 
them then bring them back up again).

The .bashrc file gets run whenever you bring up a new terminal window 
and it sets various environment variables such as PATH.  The ROS 
environment setup commands listed above cause the ROS setup.bash file to 
be run as part of your .bashrc file.

If you still have trouble, consider posting the contents of your .bashrc 
file here.


On 02/13/2011 06:21 AM, jabyers at clemson.edu wrote:
> Hello all,
> I think my biggest problem is that I am using Linux for the first time. Do
> I access ROS through the terminal application in Linux, or does ROS
> actually have a user interface, like an executable that I can click
> actually click on and open the program through? When I try to run the
> beginner tutorials, such as rospack, it says that there is no command
> 'rospack', although I have downloaded ROS following the given instructions
> on the website, all the way through the environmental setup portion.
> Therefore my next step was to work through the beginner tutorials, but all
> of the ros commands I use come back saying that there are no such
> commands. Should I re-download the program, or am I missing something? Any
> help would be greatly appreciated!
> Thank you for your time,
> Jason
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