Terminal Color and Escape Code Sequence

Java print unicode

  PrintWriter printWriter = new PrintWriter(System.out,true);
  char s = '\u0905';
  printWriter.println("Unicode = " + s);

Box Drawing PDF File

Set Foreground Color	\x1b[38;5; {color code}m \x1b[0m
Set Background Color	\x1b[48;5; {color code}m \x1b[0m

      Use 256 Colors in terminal

      Set foreground color: \x1b[38;5; {color code}m \x1b[0m
      Set background color: \x1b[48;5; {color code}m \x1b[0m
                                 |           |            |
                                 |           |            |-> reset color
                                 |           |-> RGB color (0-255)
                                 |
                                 |->  38 => foreground
                                 +->  48 => background


      24 bit RGB (Truecolor)
      {r}    {g}       {b}
      8bits  8bits     8bits = 24bits

      32 bit RGBA
      {r}    {g}       {b}    {a}
      8bits  8bits     8bits  8bits

      2^10 = 1024
      2^5 = 32 x 32 = 940 + 64 = 1024
      2^24 = (2^10)^2 * 2^2 = 1024 x 1024 = 1M*2^2 = 4M

      Set foreground color: \x1b[38;5; {r};{g};{b}m \x1b[0m
      Set background color: \x1b[48;5; {r};{g};{b}m \x1b[0m
                                 |         |            |
                               	 |         |            |-> reset color
                               	 |         +-> RGB color (0-255)
                                 |
                               	 +-> 38 => foreground
                               	 +-> 48 => background

Print console color string in Terminal

                       + -> Use color_console find out the decimal code for different color
                       ↓ 
    printf '\x1b[38;5;200mHello\x1b[0m'  # Hello (in Pink FG)
                 ↑  ↑  ↑
                 |  |  +-> Pink, decimal
                 |  +-> 
                 |
                 +-> Set foreground

    printf '\x1b[48;5;200mHello\x1b[0m'  # Hello (in Pink BG)
                  ↑ 
                  |
                  + -> Set background

    printf "\033[31;1;4mHello\033[0m"
                 ↑  ↑ ↑ 
                 |  | + → 4 → Underline 
                 |  | 
                 |  + → 1 → Bold
                 |
                 + → 31 → Red

                   
    echo  -e "\033[5;1;31mHello World\033[0m"
                   ↑ ↑  ↑  
                   | |  +- → 31 → Red
                   | + → 1 → Bold 
                   |
                   + → 5 → Blinking

              "\033[X;Y;ZmHello World\033[0m"
                    ↑ ↑ ↑   
                    X Y Z → Can be any order
                    

    printf '\x1b[48;5;200mHello\x1b[0m'  # Hello Background (in Pink)

    printf '\x1b[255;0;0mHello\x1b[0m'  # Hello (in Red)

Print console color string in Haskell

    putStrLn "\x1b[38;5;200mHello\x1b[0m"   -- Hello (in Red)

Print console color string in Java

    // SEE: $j/AsciiColor.java
    // WORK
    System.out.println((char)27 + "[31mHello" + (char)27 + "[0m");
                        ↑ 
                        + -> Escape Sequence


    System.out.println((char)27 + "[38;5;200mHello" + (char)27 + "[0m");
                                     ↑ 
                                     + -> Foreground (pink in FG)

    System.out.println((char)27 + "[48;5;200mHello" + (char)27 + "[0m");
                                     ↑ 
                                     + -> Background (pink in BG)

    // DOES NOT WORK 
    System.out.print("\033[0; 31m Hello \033[0;0m");
                        ↑      ↑
                        |      +-> Red
                        |
                        +-> Octal

    // DOES NOT WORK 
    System.out.print("\u001b[0; 31m Hello \u001b[0;0m");
                        ↑        ↑
                        |        +-> Red
                        |
                        +-> Hex

Print console color string in C

    printf("\x1b[0; 31m Hello \x1b[0;0m");
	          ↑
	          + -> Hex

Terminal Escape Sequence Code

\e → '\033' = Octal = 8 × 3 + 1 × 3 ⇒ 24 + 3 = 27 (Decimal) Escape Sequence In Shell \x1b → '\x1b' = Hexadecimal = 16 × 1 + 1 × 11 ⇒ 16 + 11 = 27 (Decimal) Escape Sequence In Shell +-> Shell Escape Sequence ↓ printf '\e[0; 31m Hello World \e[0;0m' ↑ ↑ ↑ | + -> Red | | +-> Reset ESC_SEQ +-> ESC_SEQ In Shell printf '\033[0; 31m Hello World \033[0;0m' ↑ ↑ ↑ | + -> Red | | +-> Reset ESC_SEQ +-> ESC_SEQ In Octal printf '\x1b[0; 31m Hello World \x1b[0;0m' ↑ ↑ ↑ | + -> Red | | +-> Reset ESC_SEQ +-> ESC_SEQ In Hexadicimal

What is \e ? where does it fit? Do we know somthing similar to \e ?, Yep

Name	decimal	octal	hex	C-Escape	Ctrl-Key	Description
DEL	7	007	0x07	\a	^G	Terminal bell
BS	8	010	0x08	\b	^H	Backspace
HT	9	011	0x09	\t	^I	Horizontal TAB
LF	10	012	0x0A	\n	^J	Linefeed(newline)
VT	11	013	0x0B	\v	^K	Vertical TAB
FF	12	014	0x0C	\f	^L	Formfeed(New Page NP)
CR	13	015	0x0D	\r	^M	Carriage return
ESC	27	033	0x1B	\e	^[	Escape character
DEL	127	177	0x7F	none	none	Delete character

Console color string

    # From $scr/AronLib.sh
    # '\e[;' => '\033' = Octal = 8 x 3 + 1 x 3 => 24 + 3 = 27 (Decimal)
    ESC_SEQ="\e[;"
    All_reset="${ESC_SEQ}0m"
    Bold_reset="${ESC_SEQ}21m"
    Underline_reset="${ESC_SEQ}24m"

    # Foreground colours
    Black="${ESC_SEQ}30m"
    Red="${ESC_SEQ}31m"
    Green="${ESC_SEQ}32m"
    Yellow="${ESC_SEQ}33m"
    Blue="${ESC_SEQ}34m"
    Magenta="${ESC_SEQ}35m"
    Cyan="${ESC_SEQ}36m"
    White="${ESC_SEQ}37m"

    # br => Bright
    Black_br="${ESC_SEQ}90m"
    Red_br="${ESC_SEQ}91m"
    Green_br="${ESC_SEQ}92m"
    Yellow_br="${ESC_SEQ}93m"
    Blue_br="${ESC_SEQ}94m"
    Magenta_br="${ESC_SEQ}95m"
    Cyan_br="${ESC_SEQ}96m"
    White_br="${ESC_SEQ}97m"

    # Background colours (optional)
    Black_bg="${ESC_SEQ}40m"
    Red_bg="${ESC_SEQ}41m"
    Green_bg="${ESC_SEQ}42m"
    Yellow_bg="${ESC_SEQ}43m"
    Blue_bg="${ESC_SEQ}44m"
    Magenta_bg="${ESC_SEQ}45m"
    Cyan_bg="${ESC_SEQ}46m"
    White_bg="${ESC_SEQ}47m"
    Blink_bg="${ESC_SEQ}5m"

    # Font styles
    Reg_fs="${ESC_SEQ}0m"
    Bold_fs="${ESC_SEQ}1m"
    Underline_fs="${ESC_SEQ}4m"