遠端登入虛擬機器，linux shell提示符為-bash-4.1$
要把這個提示符改掉
 
1、新建~/.bash_profile檔案
-bash-4.1$ vi ~/.bash_profile
-bash-4.1$ cat  ~/.bash_profile
cat: /home/hadoop/.bash_profile: No such file or directory
提示 許可權不夠，不能儲存

檢視使用者
-bash-4.1$ whoami
hadoop

-bash-4.1$ pwd
/home/hadoop

修改許可權
-bash-4.1$ sudo chmod 777 /home/hadoop

We trust you have received the usual lecture from the local System
Administrator. It usually boils down to these three things:

    #1) Respect the privacy of others.
    #2) Think before you type.
    #3) With great power comes great responsibility.

[sudo] password for hadoop:
hadoop is not in the sudoers file.  This incident will be reported.

2、使用root使用者，對/home/hadoop開放訪問許可權，ok
-bash-4.1$ su
Password:
[[email protected]

3、修改~/.bash_profile檔案

-bash-4.1$ vim ~/.bash_profile
加上
export PS1='[\[email protected]\h \W]\$'

4、檔案生效
-bash-4.1$ source ~/.bash_profile
 
5、現在的提示符是這樣的，ok

-bash-4.1$ source ~/.bash_profile
[[email protected] ~]$pwd
/home/hadoop
[