如何使用Go从csv复制到postgres？

I want copy my large csv-file to Postgres. Schema create table doe(firstname text, lastname text, phone text);

CSV-file

Firstname|LastName|Phone John|Doe|55-55-555 Jane|Doe|66-66-666

Go

package main

import (
    "fmt"
    "os"
    "os/exec"
)

func main() {
    cmd := "psql"
    args := fmt.Sprintf("-U postgres -d test -c \"\\copy doe from '%s' delimiter '|' csv header;\"", os.Args[1])
    if err := exec.Command(cmd, args).Run(); err != nil {
        panic(err)
    }
    println("Ok")
}

And now a have error

./copy /tmp/test.csv panic: exit status 2

goroutine 1 [running]: main.main() /tmp/copy.go:21 +0x16b

What I do wrong? If run in console

psql -U postgres -d test -c "\copy doe from '/tmp/test.csv' delimiter '|' csv header;"

COPY 2

func main() {
    cmd := "psql"
    args := []string{"-U", "postgres", "-d", "test", "-c", fmt.Sprintf(`\copy doe from '%s' delimiter '|' csv header;`, os.Args[1])}
    v, err := exec.Command(cmd, args...).CombinedOutput()
    if err != nil {
        panic(string(v))
    }
    println("Ok")
}