Ygtjki

I am trying to install Robot Operating system (ROS)in my system. At some point I need to use the following:

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

Then the following

source ~/.bashrc[![enter image description here][1]][1]

Once I do this in the terminal, it shows

bash: /home/user_name/catkin_ws/devel/setup.bash: No such file or directory

I am unable to figure out the mistake.

Note: source /opt/ros/indigo/setup.bash contains the following.

One thing you can try to use to diagnose your problem are the -x and -v options. They enables command tracing. (See the bash man page for more). -x shows commands after command substitution and -v shows them before.

set -x # turn option on
source ~/.bashrc[![enter image description here][1]][1]
set +x # turn option off

Being able to see the commands executed may give you insight into what is going wrong.

The /opt/ros/indigo/setup.bash essentially attempts to do this:

 CATKIN_SHELL=bash
 cd /opt/ros/indigo
 _CATKIN_SETUP_DIR="/opt/ros/indigo"
 . "$_CATKIN_SETUP_DIR/setup.sh"

The original script tries to extract the absolute pathname of setup.bash from $BASH_SOURCE[0], switch to that directory, and record the directory part of the path as environment variable _CATKIN_SETUP_DIR.

Finally, it will attempt to source setup.sh from the path specified by _CATKIN_SETUP_DIR environment variable.

Are you using a shell other than bash? (If you don't know, please run echo $0; echo $SHELL and add the results into your question post.)

Analysis of the line:

_CATKIN_SETUP_DIR=$(builtin cd "`dirname "$BASH_SOURCE[0]"`" > /dev/null && pwd)

For a shell other than bash, the $BASH_SOURCE[0] would most likely expand into an empty string, then dirname "" results ., builtin cd . will change nothing and be successful, and pwd after that will cause the current directory to be captured as the new value for _CATKIN_SETUP_DIR, which doesn't seem to match the likely intention of the script writer.