1. Force Email To Display All Messages As Plain Text
Do you hate those big glitter texts, colored fonts and funny emotion smiley graphics just like me!. Then you can disable these stuff and Force Mail to display all Emails as Text
Use This Command: defaults write com.apple.mail PreferPlainText -bool TRUE.
2. Change Focus In Terminal with Mouse Over
Use This Command: defaults write com.apple.terminal FocusFollowsMouse -string YES
3. Rapid Calendar
This command allows you to view the dates and stuff of any month of any year.
Use This Command: cal Jan 1991
4. View Hidden Files & Folders With The Apple Finder
Viewing files with these command maybe easy and useful, but do not delete any unknown files because they are used by the osx.
Use This Command: defaults write com.apple.finder AppleShowAllFiles TRUE.
5. Update Softwares on Apple
This command helps you to automatically update all software installed in Apple.
Use This Command: sudo softwareupdate -i -a
6. Hide Any File.
Ok, This one is my fav, Using this you can hide any file. You can hide porn (lol) or prank with your friends.
Use This Command To Hide Them
chflags hidden ~/Desktop/*