Very simple cowsay

cowsay

#!/usr/bin/env bash

set -e

say() {
    local -r msg=$(tr -d "\n" <<<"$@")
    local -ir len=${#msg}
    local hr pad

    printf -v hr -- "-%.0s" $(seq $((len > 40 ? 42 : len + 2)))
    printf -v pad -- "%$((40 - len % 40))s"

    if ((len <= 40)); then
        printf "   %s\n  < %s >\n   %s" "$hr" "$msg" "$hr"
    elif ((len <= 80)); then
        printf " %s\n/ %s \\ \n" "$hr" "${msg:0:40}"
        printf "\\ %s%s /\n %s" "${msg:40}" "$pad" "$hr"
    else
        printf " %s\n/ %s \\ \n" "$hr" "${msg:0:40}"
        for ((i = 40; i + 40 < len; i += 40)); do
            printf "| %s |\n" "${msg:i:40}"
        done
        printf "\\ %s%s /\n %s" "${msg:$((len - len % 40))}" "$pad" "$hr"
    fi

    echo -e "
\t \   ^__^
\t  \  (oo)\_______
\t     (__)\       )\/\\
\t         ||----w |
\t         ||     ||
"
}

main() {
    if (($# == 0)); then
        say "..."
        exit 1
    fi

    say "$@"
}

main "$@"