Main parent bash script to run multiple commands

main.sh

#!/usr/bin/env bash

NC='\033[0m'
red()   { echo -e "\033[0;31m$@${NC}";}
blue()  { echo -e "\033[0;96m$@${NC}";}
green() { echo -e "\033[1;32m$@${NC}";}
yellow(){ echo -e "\033[0;33m$@${NC}";}

help() {
  red "Usage:
  
./main.sh func-1 [args]
./main.sh func-2 [args]
  "
}

func-1() {
  blue "hello func-1: ${@}"
}

func-2() {
  green "hello func-2: ${@}"
}

case "$1" in
  func-1)
    func-1 ${@:2};;
  func-2)
    func-2 ${@:2};;
  *)
    help; exit 1
esac