定制 bash 命令提示符

Issue:  

1.  VM  Host的命令提示符：  bash-3.2@host$
  期望是:  username@host

bash-3.2$ echo $PS1
\s-\v\$
bash-3.2$  export PS1="\u@\h:\w\$"

Comment:  

1.  \u : username

2.  \h : hostname

3.  \w : working dir  path

add those  change  to the system  profile file 

1. make sure you are a root user

2. edit  /etc/profile file.  find  the segment related "PS1", add:
   export  PS1="\u@\h:\w\$"

Reference:

1. http://blog.sina.com.cn/s/blog_87edb138010138lc.html