ANSI Color

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ANSI Color

256 color mode of xterm ANSI

The 256 color mode of xterm

a small bash script which prints a table of escape sequences: colortable16.sh: 

#!/bin/bash

# prints a color table of 8bg * 8fg * 2 states (regular/bold)
echo
echo Table for 16-color terminal escape sequences.
echo Replace ESC with \\033 in bash.
echo
echo "Background | Foreground colors"
echo "---------------------------------------------------------------------"
for((bg=40;bg<=47;bg++)); do
	for((bold=0;bold<=1;bold++)) do
		echo -en "\033[0m"" ESC[${bg}m   | "
		for((fg=30;fg<=37;fg++)); do
			if [ $bold == "0" ]; then
				echo -en "\033[${bg}m\033[${fg}m [${fg}m  "
			else
				echo -en "\033[${bg}m\033[1;${fg}m [1;${fg}m"
			fi
		done
		echo -e "\033[0m"
	done
	echo "--------------------------------------------------------------------- "
done

echo
echo

256colors2.pl: 

#!/usr/bin/perl
# Author: Todd Larason <jtl@molehill.org>
# $XFree86: xc/programs/xterm/vttests/256colors2.pl,v 1.2 2002/03/26 01:46:43 dickey Exp $

# use the resources for colors 0-15 - usually more-or-less a
# reproduction of the standard ANSI colors, but possibly more
# pleasing shades

# colors 16-231 are a 6x6x6 color cube
for ($red = 0; $red < 6; $red++) {
    for ($green = 0; $green < 6; $green++) {
	for ($blue = 0; $blue < 6; $blue++) {
	    printf("\x1b]4;%d;rgb:%2.2x/%2.2x/%2.2x\x1b\\",
		   16 + ($red * 36) + ($green * 6) + $blue,
		   ($red ? ($red * 40 + 55) : 0),
		   ($green ? ($green * 40 + 55) : 0),
		   ($blue ? ($blue * 40 + 55) : 0));
	}
    }
}

# colors 232-255 are a grayscale ramp, intentionally leaving out
# black and white
for ($gray = 0; $gray < 24; $gray++) {
    $level = ($gray * 10) + 8;
    printf("\x1b]4;%d;rgb:%2.2x/%2.2x/%2.2x\x1b\\",
	   232 + $gray, $level, $level, $level);
}


# display the colors

# first the system ones:
print "System colors:\n";
for ($color = 0; $color < 8; $color++) {
    print "\x1b[48;5;${color}m  ";
}
print "\x1b[0m\n";
for ($color = 8; $color < 16; $color++) {
    print "\x1b[48;5;${color}m  ";
}
print "\x1b[0m\n\n";

# now the color cube
print "Color cube, 6x6x6:\n";
for ($green = 0; $green < 6; $green++) {
    for ($red = 0; $red < 6; $red++) {
	for ($blue = 0; $blue < 6; $blue++) {
	    $color = 16 + ($red * 36) + ($green * 6) + $blue;
	    print "\x1b[48;5;${color}m  ";
	}
	print "\x1b[0m ";
    }
    print "\n";
}


# now the grayscale ramp
print "Grayscale ramp:\n";
for ($color = 232; $color < 256; $color++) {
    print "\x1b[48;5;${color}m  ";
}
print "\x1b[0m\n";

Referenced from: The 90s called; they want their 256 colors back

References:


Colored Bash

echo -e "\033[31mHI"

echo "^[[0;31;40mIn Color"
<ESC>[{attr};{fg};{bg}m

Color test: 

#/bin/sh
# Show all the colors of the rainbow, should be run under bash
for STYLE in 0 1 2 3 4 5 6 7; do
  for FG in 30 31 32 33 34 35 36 37; do
    for BG in 40 41 42 43 44 45 46 47; do
      CTRL="\033[${STYLE};${FG};${BG}m"
      echo -en "${CTRL}"
      echo -n "${STYLE};${FG};${BG}"
      echo -en "\033[0m"
    done
    echo
  done
  echo
done
# Reset
echo -e "\033[0m"

The "m" character following the number code 31 (Indicating that you want to print in red) completes the instantiation of the color. Without it, your text would remain whatever color it already was. The incorrect echo statement may also have other bizarre side effects, like repositioning your cursor or resetting your terminal. The final "m" is very important :)

References:

Python ANSI Color

---

unicode - Print in terminal with colors using Python? - Stack Overflow - https://stackoverflow.com/questions/287871/print-in-terminal-with-colors-using-python 

class bcolors:
    HEADER = '\033[95m'
    OKBLUE = '\033[94m'
    OKGREEN = '\033[92m'
    WARNING = '\033[93m'
    FAIL = '\033[91m'
    ENDC = '\033[0m'
    BOLD = '\033[1m'
    UNDERLINE = '\033[4m'

print bcolors.WARNING + "Warning: No active frommets remain. Continue?" + bcolors.ENDC

class colors:
  black = 0
  red = 1
  green = 2
  yellow = 3
  blue = 4
  magenta = 5
  cyan = 6
  white = 7
  fg = 30  # foreground add
  bg = 40  # background add
  bfg = 90  # bold foreground add
  bbg = 100  # bold background add

print '\033[%dm red foreground \033[0m' % (colors.red + colors.fg)
print '\033[%dm bold red foreground \033[0m' % (colors.red + colors.bfg)
print '\033[%dm blue background \033[0m' % (colors.blue + colors.bg)
print '\033[%dm bold blue background \033[0m' % (colors.blue + colors.bbg)

---

Before you start spouting escape sequences, you should check that stdout is a tty. You can do this with sys.stdout.isatty() 

sys.stdout.isatty()

def hilite(string, status, bold):
    attr = []
    if status:
        # green
        attr.append('32')
    else:
        # red
        attr.append('31')
    if bold:
        attr.append('1')
    return '\x1b[%sm%s\x1b[0m' % (';'.join(attr), string)

Python | change text color in shell - Stack Overflow - https://stackoverflow.com/questions/2330245/python-change-text-color-in-shell

---

For reference, a small bash script which prints a table of escape sequences: colortable16.sh: (The 256 color mode of xterm, The 90s called; they want their 256 colors back) 

#!/bin/bash

# prints a color table of 8bg * 8fg * 2 states (regular/bold)
echo
echo Table for 16-color terminal escape sequences.
echo Replace ESC with \\033 in bash.
echo
echo "Background | Foreground colors"
echo "---------------------------------------------------------------------"
for((bg=40;bg<=47;bg++)); do
	for((bold=0;bold<=1;bold++)) do
		echo -en "\033[0m"" ESC[${bg}m   | "
		for((fg=30;fg<=37;fg++)); do
			if [ $bold == "0" ]; then
				echo -en "\033[${bg}m\033[${fg}m [${fg}m  "
			else
				echo -en "\033[${bg}m\033[1;${fg}m [1;${fg}m"
			fi
		done
		echo -e "\033[0m"
	done
	echo "--------------------------------------------------------------------- "
done

echo
echo

Python version: (modified by me) 

#!/usr/bin/env python

import sys

# prints a color table of 8bg * 8fg * 2 states (regular/bold)
print
print "Table for 16-color terminal escape sequences."
print "Replace ESC with \\033 in bash."
print
print "Background | Foreground colors"
print "---------------------------------------------------------------------"
for bg in range(40, 47+1):
  for bold in range(0, 1+1):
                sys.stdout.write("\033[0m"" ESC[{bg}m   | ".format(bg=bg))
                for fg in range(30, 37+1):
                        if bold == 0:
                                sys.stdout.write("\033[{bg}m\033[{fg}m [{fg}m  ".format(bg=bg, fg=fg))
                        else:
                                sys.stdout.write("\033[{bg}m\033[1;{fg}m [1;{fg}m".format(bg=bg, fg=fg))
                sys.stdout.write("\033[0m\n")
  print "--------------------------------------------------------------------- "

print
print

keywords

ANSI Color

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