Table of ANSI color escape sequence combinations

terminal-color-sequence.sh

#!/bin/sh

for bg in '' $(seq 40 47 | sed 's/^/;/'); do
    for bold in '' 1; do
        for fg in '' $(seq 30 37 | sed 's/^/;/'); do
            code="${bold}${fg}${bg}"
            code="${code#;}"
            printf '\033[%sm %7s\033[0m' "${code}" "${code}"
        done
        printf '\n'
    done
done

Example: