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This command is done one time only:

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

Once it is appended to .bashrc everytime you open a new terminal the bash script /opt/ros/indigo/setup.bash is run.

You could edit .bashrc in a number of ways to add the line "source /opt/ros/indigo/setup.bash" to the end of the .bashrc file, echo is just a handy way to edit .bashrc.

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