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#  To list software you currently have installed with version numbers, use:
 
brew list --versions
 
#  To see just the software, which is not a dependency of another:
 
brew leaves
 
#  To keep the Homebrew itself up-to-date, and fetch the newest version from GitHub:
 
brew update
 
#  After updating the brew, check which formulae have an updated version available, display detailed version information to see if you have more than one older version laying around:
 
brew outdated --verbose
 
#  See any app that you no longer need and want to get rid of them? Check the dependencies for all installed formulae:
 
brew deps --installed
 
#  For even more detailed picture, show the dependencies for all installed formulae as a tree:
 
brew deps --installed --tree
 
#  As a final precaution before removing a formula, see what other installed formulae use it as a dependency:
 
brew uses --installed formula
 
#  Uninstall formulae and all their older versions:
 
brew remove --force formulae
 
#  Upgrade remaining formulae:
 
brew upgrade
 
#  Show what will be removed by cleanup command, but do not actually remove anything:
 
brew cleanup -ns
 
#  Clean the "Cellar" removing any older versions of installed formulae and clearing old downloads from the Homebrew download-cache. Additionally, scrub the cache, removing downloads for even the latest versions of formula, which are downloaded, but not installed:
 
brew cleanup -s