You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: shell.go
    path of file: ./repos/micro/internal/shell
    
    the code of the file until where you have to start completion: package shell

import (
	"bytes"
	"errors"
	"fmt"
	"io"
	"os"
	"os/exec"
	"os/signal"

	shellquote "github.com/kballard/go-shellquote"
	"github.com/zyedidia/micro/v2/internal/screen"
)

// ExecCommand executes a command using exec
// It returns any output/errors
func ExecCommand(name 
    
func RunBackgroundShell(input string) (func() string, error) {
	args, err := shellquote.Split(input)
	if err != nil {
		return nil, err
	}
	if len(args) == 0 {
		return nil, errors.New("No arguments")
	}
	inputCmd := args[0]
	return func() string {
		output, err := RunCommand(input)

		str := output
		if err != nil {
			str = fmt.Sprint(inputCmd, " exited with error: ", err, ": ", output)
		}
		return str
	}, nil
}