golang+read_file+call_shell+goroutine

package main

import (
        "bufio"
        "bytes"
        "fmt"
        "os"
        "os/exec"
        "sync"
)

//call shell
func call_shell(script_name string, script_args string) (string, string, error) {
        var script_stdout bytes.Buffer
        var script_stderr bytes.Buffer
        cmd := exec.Command("/bin/bash", script_name, script_args)
        cmd.Stdout = &script_stdout
        cmd.Stderr = &script_stderr
        err := cmd.Run()
        return script_stdout.String(), script_stderr.String(), err
}

func main() {

        var wg sync.WaitGroup

        //Open file
        file_path, _ := os.Getwd()
        file, err := os.Open(file_path + "/db_list")
        if err != nil {
                fmt.Print("Open file error")
        }
        defer file.Close()
        //Read file line by line
        scanner := bufio.NewScanner(file)
        for scanner.Scan() {
                wg.Add(1)
                go func(db_name string) {
                        defer wg.Done()
                        shell_path := "/opt/go_workspace/script/auto_dump.sh"
                        script_stdout, script_stderr, _ := call_shell(shell_path, db_name)
                        fmt.Printf("Dump db log for %s
%s
%s
", db_name, script_stdout, script_stderr)
                }(scanner.Text())

        }

        wg.Wait()
}