Modify shell terminal prompt information

PS1: the user's usual prompt.
PS2: the first line is not complete. Wait for the prompt entered in the second line.

Public setting location:/etc/profile

Echo $ PS1 can see the current prompt settings
For example, Green is displayed and time and shell version are added.
Export PS1 = "\ [\ e [32m \] [\ U @ 'you are right' \ W \ t \ v \ D] \ $"
Or
PS1 = "\ [\ e [32m \] [\ U @ 'you are right' \ W \ t \ v \ D] \ $"

Or

 

Export PS1 = "\ [\ e [31m \] [\ U @ \ H \ W] \$ {? #0 }#\ [\ e [0m \]"

 

[Root @ WWW ~] # Echo $ PS1
[\ U @ \ H \ W] \ $

after restarting, you only need to modify the configuration file.
for the current user, you only need to modify ~ /. Bashrc, for all users in the system, modify/etc/bashrc
ps1 = "\ [\ e [32m \] [\ U @ \ H \ W \ t \ v \ D] \ \ $ "
export PS1

the default special symbol in Shell environment:
\ D: represents the date, in the format of weekday month date, for example:" Su N sep 18 "
\ H: The complete host name. For example, my machine name is RedHat. in Linux, the name is fc4.linux
\ H: only the first name of the host. In the preceding example, the name is RedHat. linux ,. linux is omitted
\ t: The display time is in the 24-hour format, for example, HH: mm: SS
\ t: display time: 12 hours format
\ A: display time: 24 hours format: hh: mm
\ U: Account name of the current user
\ V: bash version
\ W: complete working directory name. In the home directory ~ Replace
\ W: Use basename to get the working directory name, so only the last directory is listed
\#: the commands issued
\$: prompt character. If it is root, the prompt is: #, and the normal user is: $
\ n: Line Break

font or background color modification:
In ps1, set the Character Sequence color format to \ [\ e [F; BM \]
where ''f'' is the font color, 30-30 ~ 37; ''B 'indicates the background color, numbered 40 ~ 47
you can use ''\ e [0m'' to disable color output. When B is set to 1, highlighted and bold text is displayed.

Color correspondence:
30 40 black
31 41 colors
32 42 colors
33 43 colors
34 44 colors
35 45 Violet colors
36 46 green colors
37 47 white
CodeMeaning:
0 off
1 highlighted
4 underline
5 flashes
7. Reverse display
8 invisible