mat

main.go

package main

import (
	"fmt"
	"io"
	"os"
)

func main() {

	filenames := os.Args[1:]

	for _, f := range filenames {

		c, err := os.Open(f)

		if err != nil {
			fmt.Fprintf(os.Stderr, "error: %s\n", err.Error())
			continue
		}

		_, err = io.Copy(os.Stdout, c)

		if err != nil {
			fmt.Fprintf(os.Stderr, "error: %s\n", err.Error())
			os.Exit(1)
		}
	}
}