package main import ( "encoding/pem" "flag" "fmt" "io/ioutil" "os" "github.com/kisom/goutils/lib" ) func main() { flag.Parse() if flag.NArg() != 1 { lib.Errx(lib.ExitFailure, "a single filename is required") } var in []byte var err error path := flag.Arg(0) if path == "-" { in, err = ioutil.ReadAll(os.Stdin) } else { in, err = ioutil.ReadFile(flag.Arg(0)) } if err != nil { lib.Err(lib.ExitFailure, err, "couldn't read file") } p, _ := pem.Decode(in) if p == nil { lib.Errx(lib.ExitFailure, "%s isn't a PEM-encoded file", flag.Arg(0)) } fmt.Printf("%s", p.Bytes) }