simple commit message hook to validate message contain :

commit-msg.sh

#!/bin/bash

MSG="$1"
message="Hey! looks like your commit message is not following correct format"

if ! grep -qE ":" "$MSG";
then
    printf "\n";
    echo -e "\e[91m${message}\e[0m";
    echo "Your commit message: " && cat "${MSG}";
    printf "\n";
    exit 1
fi