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Yes, with every new shell/terminal that is opened, I need to source my file. (terminal = shell ... in some way).

So how can this become automatically? Tthe answer that @SAI KISHOR KOTHAKOTA was correct. But because I am a noob, it took me some time and research to find out what exactly he meant and what I needed to do. So I will write down here, in a step-by-step way, how I did it and then some explanation.

STEPS:

1. Open your terminal
2. Write the command --> gedit ~/.bashrc
3. I file will open on gedit
4. Go to the bottom (my last line was "source /opt/ros/indigo/setup.bash" , for others it may differ)
5. Go under that line and write --> source [YOUR PATH]/catkin_ws/devel/setup.bash
6. Save and exit
7. Now with every new shell you open, it will source automatically

Explanation:

So, from what I know, the .bashrc file runs automatically for every new shell you open. So now, every time you open a shell, all of those command run plus the new command you added (the source command).

Yes, with every new shell/terminal that is opened, I need to source my file. (terminal = shell ... in some way).

So how can this become automatically? Tthe The answer that @SAI KISHOR KOTHAKOTA was correct. But because I am a noob, it took me some time and research to find out what exactly he meant and what I needed to do. So I will write down here, in a step-by-step way, how I did it and then some explanation.

STEPS:

1. Open your terminal
2. Write the command --> gedit ~/.bashrc
3. I file will open on gedit
4. Go to the bottom (my last line was "source /opt/ros/indigo/setup.bash" , for others it may differ)
5. Go under that line and write --> source [YOUR PATH]/catkin_ws/devel/setup.bash
6. Save and exit
7. Now with every new shell you open, it will source automatically

Explanation:

So, from what I know, the .bashrc file runs automatically for every new shell you open. So now, every time you open a shell, all of those command run plus the new command you added (the source command).