First, copy the plist file from (take note, that the number 1,590 may vary in each machine)
/usr/local/Cellar/jenkins/1.590
to LaunchAgent folder:
cp /usr/local/Cellar/jenkins/1.590/homebrew.mxcl.jenkins.plist /Users/medianet/Library/LaunchAgents
Now, you can Start Jenkins
launchctl load ~/Library/LaunchAgents/homebrew.mxcl.jenkins.plist
And Stop Jenkins
launchctl unload ~/Library/LaunchAgents/homebrew.mxcl.jenkins.plist
To have start jenkins at login:
ln -sfv /usr/local/opt/jenkins/*.plist ~/Library/LaunchAgents
Then load jenkins:
launchctl load ~/Library/LaunchAgents/homebrew.mxcl.jenkins.plist
Or, if you don't want/need launchctl, you can just run:
java -jar /usr/local/opt/jenkins/libexec/jenkins.war
Or, in my case using this path:
java -jar /usr/local/Cellar/jenkins/1.590/libexec/jenkins.war
Other paths if Jenkins wasn't installed with Brew
~/Library/LaunchAgents Per-user agents provided by the user.
~/Library/LaunchAgents Per-user agents provided by the administrator.
~/Library/LaunchDaemons System wide daemons provided by the administrator.