Golang lsof server

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package mainimport (  "net/http"  "fmt"  "os/exec"  "flag")func main(){   http.HandleFunc("/",  readHandle)   port := flag.Int("port", 2012, "Listen Port")   flag.Parse()   http.ListenAndServe(fmt.Sprintf(":%d", *port), nil) }func readHandle(w http.ResponseWriter, r *http.Request){        /* Command */        lsof := exec.Command("lsof", r.FormValue("path"))        wc := exec.Command("wc", "-l")        /* Pipe */        lsofOut,_ := lsof.StdoutPipe()        /* Command Start */        lsof.Start()        /* Stdin */        wc.Stdin = lsofOut        out,_ := wc.Output()        fmt.Fprintf(w, "%v", r.FormValue("path"))        fmt.Fprintf(w, "%s", out)        fmt.Fprintf(w, "%s", r.URL.Path[1:])}