fcat, zcat for zlib packs

fcat.go

package main

import (
	"compress/gzip"
	"io"
	"log"
	"os"
)

func main() {
	var (
		f   *os.File
		err error
	)

	if len(os.Args) < 2 {
		f = os.Stdin
	} else {
		f, err = os.Open(os.Args[1])
		if err != nil {
			log.Fatal(err)
		}
		defer f.Close()
	}

	zr, err := gzip.NewReader(f)
	if err != nil {
		log.Fatal(err)
	}
	defer zr.Close()

	io.Copy(os.Stdout, zr)
}