The following is a list of coala’s exit codes and their meanings:
0- coala executed successfully but yielded no results.
1- coala executed successfully but yielded results.
2- Invalid arguments were passed to coala in the command line.
3- The file collector exits with this code if an invalid pattern is passed to it.
4- coala was executed with an unsupported version of python
5- coala executed successfully. Results were found but patches to the results were applied successfully
13- There is a conflict in the version of a dependency you have installed and the requirements of coala.
Ctrl+C) was pressed during the execution of coala.
255- Any other general errors.