Colors in the Shell

function show_colors () {
 color=16;

 while [ $color -lt 245 ]; do
  echo -e "$color: \\033[38;5;${color}mhello\\033[48;5;${color}mworld\\033[0m"
  ((color++));
 done
}

function colorgrid() {
  iter=16
  while [ $iter -lt 52 ]
  do
    second=$[$iter+36]
    third=$[$second+36]
    four=$[$third+36]
    five=$[$four+36]
    six=$[$five+36]
    seven=$[$six+36]
    if [ $seven -gt 250 ];then seven=$[$seven-251]; fi

    echo -en "\033[38;5;$(echo $iter)m█ "
    printf "%03d" $iter
    echo -en "   \033[38;5;$(echo $second)m█ "
    printf "%03d" $second
    echo -en "   \033[38;5;$(echo $third)m█ "
    printf "%03d" $third
    echo -en "   \033[38;5;$(echo $four)m█ "
    printf "%03d" $four
    echo -en "   \033[38;5;$(echo $five)m█ "
    printf "%03d" $five
    echo -en "   \033[38;5;$(echo $six)m█ "
    printf "%03d" $six
    echo -en "   \033[38;5;$(echo $seven)m█ "
    printf "%03d" $seven

    iter=$[$iter+1]
    printf '\r\n'
  done
}

CEND      = '\33[0m'
CBOLD     = '\33[1m'
CITALIC   = '\33[3m'
CURL      = '\33[4m'
CBLINK    = '\33[5m'
CBLINK2   = '\33[6m'
CSELECTED = '\33[7m'

CBLACK  = '\33[30m'
CRED    = '\33[31m'
CGREEN  = '\33[32m'
CYELLOW = '\33[33m'
CBLUE   = '\33[34m'
CVIOLET = '\33[35m'
CBEIGE  = '\33[36m'
CWHITE  = '\33[37m'

CBLACKBG  = '\33[40m'
CREDBG    = '\33[41m'
CGREENBG  = '\33[42m'
CYELLOWBG = '\33[43m'
CBLUEBG   = '\33[44m'
CVIOLETBG = '\33[45m'
CBEIGEBG  = '\33[46m'
CWHITEBG  = '\33[47m'

CGREY    = '\33[90m'
CRED2    = '\33[91m'
CGREEN2  = '\33[92m'
CYELLOW2 = '\33[93m'
CBLUE2   = '\33[94m'
CVIOLET2 = '\33[95m'
CBEIGE2  = '\33[96m'
CWHITE2  = '\33[97m'

CGREYBG    = '\33[100m'
CREDBG2    = '\33[101m'
CGREENBG2  = '\33[102m'
CYELLOWBG2 = '\33[103m'
CBLUEBG2   = '\33[104m'
CVIOLETBG2 = '\33[105m'
CBEIGEBG2  = '\33[106m'
CWHITEBG2  = '\33[107m'