Full description of csh Prompt--customize your own linux command line prompt

cshell Prompt is mainly composed of two parts, one is the color definition, the other is the information display. Below we discuss these two parts separately.

color (ASCII color)

All colors are written in the form of \033[xxxm e94ef03e18393e35354504b042ef2dd5---, xxx are parameters separated by semicolons

C

 printf("\033[31;1;4mHello\033[0m");

C++

 std::cout<<"\033[31;1;4mHello\033[0m";

python3

 print("\033[31;1;4mHello\033[0m")

shell

 echo -e "\033[31;1;4mHello\033[0m"

font effect

Code	Effect	Note
0	Reset / Normal	all attributes off
1	Bold or increased intensity
2	Faint (decreased intensity)	Not widely supported.
3	Italic	Not widely supported. Sometimes treated as inverse.
4	Underline
5	Slow Blink	less than 150 per minute
6	Rapid Blink	MS-DOS ANSI.SYS; 150+ per minute; not widely supported
7	[[reverse video]]	swap foreground and background colors
8	Conceal	Not widely supported.
9	Crossed-out	Characters legible, but marked for deletion. Not widely supported.
10	Primary(default) font
11–19	Alternate font	Select alternate font n-10
20	Fraktur	hardly ever supported
twenty one	Bold off or Double Underline	Bold off not widely supported; double underline hardly ever supported.
twenty two	Normal color or intensity	Neither bold nor faint
twenty three	Not italic, not Fraktur
twenty four	Underline off	Not singly or doubly underlined
25	Blink off
27	Inverse off
28	Reveal	conceal off
29	Not crossed out
30–37	Set foreground color	See color table below
38	Set foreground color	Next arguments are 5;<n> or 2;<r>;<g>; , see below
39	Default foreground color	implementation defined (according to standard)
40–47	Set background color	See color table below
48	Set background color	Next arguments are 5;<n> or 2;<r>;<g>; , see below
49	Default background color	implementation defined (according to standard)
51	Framed
52	Encircled
53	Overlined
54	Not framed or encircled
55	Not overlined
60	ideogram underline	hardly ever supported
61	ideogram double underline	hardly ever supported
62	ideogram overline	hardly ever supported
63	ideogram double overline	hardly ever supported
64	ideogram stress marking	hardly ever supported
65	ideogram attributes off	reset the effects of all of 60-64
90–97	Set bright foreground color	aixterm (not in standard)
100–107	Set bright background color	aixterm (not in standard)

4bit color code

Only 8 colors are supported in the original specification. SGR uses 30-37 to define the foreground color and 40-47 to define the background color.

• If you want to get a black fixed rest on a white background, you can use \033[33;47m , 30 for the foreground color and 47 for the background color.
• To get bright red, use \033[1;31m , 1 for vivid.
• To reset all properties, use \033[0m
• To use bright colors directly, use 90-97 and 100-107

According to the above figure, if you want to use red foreground color and green background color, you can write: \033[31;42m

8bit color code

Foreground Color: \033[38;5;XXXm
Background Color: \033[48;5;XXXm

According to the above graph,

• If you want to use pink font, you can write it like this: \033[38;5;206m , 206 is its foreground color
• If you want to use the morning green background, you can write: \033[48;5;57m , 57 is its background color

Can be combined: \033[38;5;206;48;5;57m

The approximate range of the 8bit color code is as follows:

scope	describe
0x00-0x07	Standard color, same as 4bit
0x08-0x0F	highly colored
0x10-0xE7	6x6x6 space (216 colors): 16 + 36 xr + 6 xg + b (0<=r, g, b <=5)
0xE8-0xFF	24 shades of gray from black to white

24bit full color system

If it supports true color , then the color can be described in the following way:

Foreground Color: \033[38;2;<r>;<g>;<b>m
Background color: \033[48;2;<r>;<g>;<b>m

Foreground and background colors can be mixed to describe:

\033[38;2;255;82;197;48;2;155;106;0mHello

scripts to print

 #!/usr/bin/python

print "\\033[XXm"

for i in range(30,37+1):
    print "\033[%dm%d\t\t\033[%dm%d" % (i,i,i+60,i+60);

print "\033[39m\\033[49m - Reset colour"
print "\\033[2K - Clear Line"
print "\\033[<L>;<C>H OR \\033[<L>;<C>f puts the cursor at line L and column C."
print "\\033[<N>A Move the cursor up N lines"
print "\\033[<N>B Move the cursor down N lines"
print "\\033[<N>C Move the cursor forward N columns"
print "\\033[<N>D Move the cursor backward N columns"
print "\\033[2J Clear the screen, move to (0,0)"
print "\\033[K Erase to end of line"
print "\\033[s Save cursor position"
print "\\033[u Restore cursor position"
print " "
print "\\033[4m  Underline on"
print "\\033[24m Underline off"
print "\\033[1m  Bold on"
print "\\033[21m Bold off"

Terminal and message format

In cshell, the content inside %`{...%} means that it takes no space (0-width).
\e[...m or \033[...m for color. As described above.

The color \033[0m is used to reset the color

prompt format

symbol	describe
%/	Current working directory.
%~	cwd. If it starts with $HOME, that part is replaced by a ~. In addition if a directory name prefix matches a user's home directory, that part of the directory will be substituted with ~user. NOTE: The ~user substitution will only happen if the shell has performed a ~ expansion for that user name in this session.
%c or %.	Trailing component of cwd, may be followed by by a digit to get more than one component, if it starts with $HOME, that part is replaced with a ~.
%C	Trailing component of cwd, may be followed by a digit to get more than one component, no ~ substitution.
%h, %!, !	Current history event number.
%M	The full machine hostname.
%m	The hostname up to the first ".".
%S (%s)	Start (stop) standout mode.
%B (%b)	Start (stop) boldfacing mode. (Only if
	tcsh was compiled to be eight bit clean.)
%U (%u)	Start (stop) underline mode. (Only if
	tcsh was compiled to be eight bit clean.)
%t or %@	Current time of day, in 12-hour, am/pm format.
%T	Current time of day, in 24-hour format.
	(But see the ampm shell variable below.)
%p	Current time in 12-hour format, am/pm format with seconds.
%P	Current time in 24-hour format, with seconds.
\c	`c' is parsed the same way as in bindkey.
^c	`c' is parsed the same way as in bindkey.
%%	A single %.
%n	The user name, contents of $user.
%d	The weekday in <Day> format.
%D	The day in dd format.
%w	The month in <Mon> format.
%W	The month in mm format.
%y	The year in yy format.
%Y	The year in yyyy format.
%l	The line (tty) the user is logged on.
%L	clear from prompt to end of display or end of line.
%#	A #' if tcsh is run as a root shell, a >' if not.
%{..%}	Include string as a literal escape sequence. Note that the enclosed escape sequence, should only be used to change terminal attributes and should not move the cursor location. Also, this cannot be the last character in the prompt string. (Available only if tcsh was compiled to be eight bit clean.)
%?	return code of the last command executed just before the prompt.
%R	In prompt3 this is the corrected string; in prompt2 it is the status of the parser.

Common colors

30 - black
31 - red
32 - green
33 - yellow
34 - blue
35 - magenta
36 - cyan
37 - white

Common effects

0 - normal
1 - bold
2 - normal again
3 - background color
4 - underline the text
5 - blinking

special

If you want to use \n in prompt, you cannot define a color for it alone, otherwise the cursor will be confused.

example

 set prompt="\n%{\033[0;32m%}%n @ %m:%{\033[0;33m%}%~%{\033[1;30m%} [%P]\n%{\033[0;35m%}#%{\033[0m%} " '

The effect is as follows

Quote:
ANSI-Color WIki
TCSH Manual