1. Install or uninstall Jenkins

mac:~ hooni$ brew install jenkins-lts
mac:~ hooni$ brew uninstall jenkins-lts
mac:~ hooni$ brew upgrade jenkins-lts

2. Start/Stop Jenkins

mac:~ hooni$ brew services start jenkins-lts
mac:~ hooni$ brew services stop jenkins-lts
mac:~ hooni$ brew services restart jenkis-lts
mac:~ hooni$ brew sesrvices list

3. default initial dmin password

mac:~ hooni$ sudo cat ~/.jenkins/secrets/initialAdminPassword
mac:~ hooni$ cat ~/Library/Logs/Jenkins/secrets/initialAdminPassword