To find where a process is launched from, as well as it’s source code and manual if available, the useful whereis command comes in handy.
To find for example, where the bash binary is located, just run:
whereis bash
It will output something like:
bash: /bin/bash /etc/bash.bashrc /usr/share/man/man1/bash.1.gz

This tells me the following about the bash process:
- The binary is located in /bin/bash
- The source code is located in /etc/bash.bashrc
- The manual (man bash) is located in /usr/share/man/man1/bash.1.gz