Проверка цветов терминала

#!/usr/bin/perl
# Author: Todd Larason <jtl{@}molehill.org>
# $XFree86: xc/programs/xterm/vttests/256colors2.pl,
# v 1.1 1999/07/11 08:49:54 dawes 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; $blue++) {
	    printf("x1b]4;%d;rgb:%2.2x/%2.2x/%2.2xx1b",
		   16 + ($red * 36) + ($green * 6) + $blue,
		   int ($red * 42.5),
		   int ($green * 42.5),
		   int ($blue * 42.5));
	}
    }
}

# 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/%2.2xx1b",
	   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[0mn";
for ($color = 8; $color < 16; $color++) {
    print "x1b[48;5;${color}m  ";
}
print "x1b[0mnn";

# 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[0mn";