Full preview for tput foreground and background

tput-table

#!/bin/bash
# author: janlay@gmail.com

set -e

cols=$(bc <<< "$(tput cols) / 3 - 2")
char=✾

echo -n '   '
for col in $(seq 0 $cols); do
    printf '%3s' $col
done
echo

for f in {0..255}; do
    printf '%3s' $f
    f_color=$(tput setaf $f)
    for b in $(seq 0 $cols); do
        echo -n "$f_color$(tput setab $b) $char "
    done
    echo $(tput sgr0)
done