mxcl/homebrew — pull request #24052 by voanhduy1512 (2013-11-07 10:40:58+00:00)
Title: add output for brew outdated & brew upgrade

When i run brew outdated or brew upgrade with no outdated package, the command run though with no output. It make me feel like something when wrong. So an message "Already up-to-date." like brew update may help here