Script to build golang with param of -o [operating_sys] -n [output_name]

gobuild.sh

#!/bin/bash

#how to use
# cd ~ && mkdir gobuildscript && cd gobuildscript && https://gist.github.com/Danendra10/2910ae7a55e066aa03fec7c967e00b71 && chmod +x gobuild.sh && echo "alias gobuild="~/gobuildscript/gpbuild.sh" >> ~/.bashrc && source ~/.bashrc 
output_name="main"
os="linux"

# Define colors
RED='\033[0;31m'
GREEN='\033[0;32m'
YELLOW='\033[0;33m'
NC='\033[0m' # No Color

if [[ $1 == "--help" || $1 == "-h" ]]; then
    echo -e "${GREEN}Usage:${NC} ./script.sh ${YELLOW}-o [operating_system]${NC} ${YELLOW}-n [output_name]${NC}"
    echo ""
    echo -e "${GREEN}PARAMETERS:"
    echo -e "${YELLOW}-o:${NC} OS"
    echo -e "${YELLOW}-n:${NC} output name"
    echo ""
    exit 0
fi

while getopts ":o:n:" opt; do
  case ${opt} in
    o )
      os=$OPTARG
      ;;
    n )
      output_name=$OPTARG
      ;;
    \? )
      echo "Invalid option: $OPTARG" 1>&2
      exit 1
      ;;
    : )
      echo "Invalid option: $OPTARG requires an argument" 1>&2
      exit 1
      ;;
  esac
done

echo "Building for OS: $os"
echo "Output name: $output_name"

GOOS = $os
echo "BUILDING ${output_name}"
go build -o ${output_name} main.go
echo "BUILD DONE"