1. 首先用help理解su， sudo su， sudo

2. 其次理解"login shell" and "interactive shell".

"When Bash starts executes the commands in a variety of different scripts.

(1) When started as an interactive login shell: Bash reads and executes the /etc/profile (if it exists). After reading that file, it looks for ~/.bash_profile, ~/.bash_login, and ~/.profile in that order, and reads and executes the first one (that exists and is readable).? When a login shell?exits: Bash reads and executes ~/.bash_logout (if it exists).

(2) When started as an interactive shell (but not a login shell): Bash reads and executes ~/.bashrc (if it exists)."

顯然login shell和interactive shell在環境的設置上是存在差別的，詳細可以參考： http://groups.google.com/group/Linux.debian.user/browse_thread/thread/2b71ecfc45789958/7bff24e3bae74b36?lnk=raot

3.? 然后su命令的橫杠就非常容易理解了，參數橫杠-， 是為了讓切換獲取的shell是一個login shell

-, -l, --login?????????????? make the shell a login shell

時間： 08-11

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