Bash shell

Which Bash config to run depends on two conditions -- Interactive vs. Non-interactive, and Login vs. Non-login

Login shell
- Start with 'bash --login' or 'bash -'
- Run the following config files: /etc/profile, ~/.bash_profile, then ~/.bash_login and lastly ~/.profile. When login shells exit, they read ~/.bash_logout.

Nonlogin shell
- Read .bashrc
- Should not put any output-producing code in this file because the standard stream could be redirected.

Keep tracks of defaults write and Useful defaults write commands

In .bashrc, create the line

PROMPT_COMMAND='echo "$(history 1 | grep "defaults")" | sed '/^$/d' >> ~/Documents/defaults.txt'

To undo the changes, use 'defaults delete'. For example,
defaults write xxx - bool false
defaults delete xxx

- Change to transparent dock in Mavericks

defaults write com.apple.dock hide-mirror -bool true;killall Dock

- Change screen capture file format

defaults write com.apple.screencapture type jpg; killall SystemUIServer
defaults write com.apple.screencapture disable-shadow -bool false

- Add 'Save as' back to applications

defaults write com.apple.iWork.Keynote ApplePersistence - bool no

defaults write com.apple.TextEdit ApplePersistence - bool no

defaults write com.apple.Preview ApplePersistence - bool no