tmux.colors.sh

gistfile1.txt

#!/usr/bin/env bash
for i in $(seq 0 4 255); do
        for j in $(seq $i $(expr $i + 3)); do
                for k in $(seq 1 $(expr 3 - ${#j})); do
                        printf " "
                done
                printf "\x1b[48;5;${j}mcolour${j}\x1b[48;0;"
                [[ $(expr $j % 4) != 3 ]] && printf "    "
        done
        printf "\n"
done