Linux environment configs

Term:  login shell => the current bash you had typed in account&password to login

• /etc/profile : Only read by "login shell"

• /etc/profile.d/*.sh : Auto-load all the *.sh.

• /etc/locale.conf : Which language to use.

• /usr/share/bash-completion/completions/* : For keyboard "Tab" functions. 

• ~/.bash_profile : Only read by "login shell", execute by order. (Mac OS X use it to replace ~/.bashrc)

1. ~/.bash_profile : found then stop next

2. ~/.bash_login : found then stop next

3. ~/.profile : found then stop next

• ~/.bashrc : Non-login shell