Simple wildcard concatenation program

wildcat.go

package main

import (
	"bytes"
	"io/ioutil"
	"log"
	"os"
	"path/filepath"
)

func main() {
	if len(os.Args) == 1 {
		log.Fatalln("Missing required argument.")
	}

	pattern := os.Args[1]
	files, err := filepath.Glob(pattern)
	if err != nil {
		log.Fatalf("Failed to get list of files from pattern: %s\n", pattern)
	}

	var buffer bytes.Buffer

	for _, file := range files {
		data, readErr := ioutil.ReadFile(file)
		if readErr != nil {
			log.Printf("Could not read file: %s due to error %s)\n", file, readErr)
		} else {
			buffer.Write(data)
		}
	}

	_, err = buffer.WriteTo(os.Stdout)
	if err != nil {
		log.Fatalf("Could not write buffer to standard output: %s\n", err)
	}
}