Print out 256-color terminal color codes in their respective colors

256colors.sh

#!/bin/bash

for i in {0..15}; do
    row=
    for j in {1..16}; do
        color=$(( $i*16 + $j -1 ))
        code="\033[00;38;5;${color}m${color}"
        if [[ $row == "" ]]; then
            row=$code
        elif [[ $color -lt 11 ]]; then
            row="$row\x20\x20\x20$code"
        elif [[ $color -lt 101 ]]; then
            row="$row\x20\x20$code"
        else
            row="$row $code"
        fi
    done
    echo -e $row
done