export PATH=$PATH:/path_to_the_executable_file/
Launch the "list_all" executable file when located in the IF110-tree folder. The file can be executed either by calling it from the PATH environment variable:
~IF110-tree$ list_all
Or using relative or absolute path:
~IF110-tree$ ./../IF110-project/list_all
~IF110-tree$ /path/to/folder/IF110-project/list_all