I know how to notify build status using the slack notification plugin. I can see
project - #buildnumber Success after 1 min 18 sec (Open) in my slack channel. But I want the console output to be sent to slack as well (upon failure) instead of a link. I am using free style project since I need some scripts to build my project. The purpose is that I want engineers to know the result of their build without granting them Jenkins access.
if console log can be uploaded as a text, would be also good. Other forms of 'output' would be welcome as well.
I found the answer by myself.