[go-nuts] Getting error back after executing a shell script via Golang

[DM]

Cross-posting this from stackoverflow 
<http://stackoverflow.com/questions/39764600/getting-error-back-after-executing-a-shell-script-via-golang>
:-

I have a simple shell script (named copy.sh) which looks like below:-

#! /bin/sh

cp $1 $2

I did chmod 777 copy.sh.

I have a golang code which executes the above shell code:-

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

func main() {
    _, err := exec.Command("/Users/debraj/copy.sh", "/Users/debraj/temp.txt", 
"/Users/debraj/gotest/").Output()
    if err != nil {
        fmt.Println("Failed to execute command " + err.Error())
        return
    }
    fmt.Printf("\nCopy Successful - %v")}

The above code is showing be the below output:-

jabongs-MacBook-Pro-4:src debraj$ go run copyerr.go Failed to execute command 
exit status 1
jabongs-MacBook-Pro-4:src debraj$ 

But the error I receive from shell script looks like below:-

jabongs-MacBook-Pro-4:~ debraj$ ./copy.sh /Users/debraj/temp.txt 
/Users/debraj/gotest/
cp: /Users/debraj/gotest/temp.txt: Permission denied     

Can someone let me know how how can I get the same error message that is 
returned by the shell script?

If I don;t do chmod 777 copy.sh and the file has permission as below:-

jabongs-MacBook-Pro-4:~ debraj$ ls -la copy.sh -rw-r--r--  1 debraj  staff  21 
Sep 29 13:28 copy.sh

Then the golang code gives the output as given by the shell script. Can 
some also let me know why this is behaving like this?

I am on

   - Golang 1.7
   - Mac OS X 10.11.4

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