Spawning process _ golang

package main
import (
 "fmt"
 "io/ioutil"
 "os/exec"
)
func main() {
 dateCmd := exec.Command("date")
 dateOut, err := dateCmd.Output()
 if err != nil {
 panic(err)
 }
 fmt.Println("> date")
 fmt.Println(string(dateOut))
 grepCmd := exec.Command("grep", "hello")
 grepIn, _ := grepCmd.StdinPipe()
 grepOut, _ := grepCmd.StdoutPipe()
 grepCmd.Start()
 grepIn.Write([]byte("hello grep\ngoodbye grep"))
 grepIn.Close()
 grepBytes, _ := ioutil.ReadAll(grepOut)
 grepCmd.Wait()
 fmt.Println("> grep hello")
 fmt.Println(string(grepBytes))
 lsCmd := exec.Command("bash", "-c", "ls -a -l -h")
 lsOut, err := lsCmd.Output()
 if err != nil {
 panic(err)
 }
 fmt.Println("> ls -a -l -h")
 fmt.Println(string(lsOut))
}

> date
Wed Apr 1 13:15:32 CST 2015
> grep hello
hello grep
> ls -a -l -h
total 3648
drwxr-xr-x 16 xjk staff 544B Apr 1 13:09 .
drwxr-xr-x+ 30 xjk staff 1.0K Mar 6 14:00 ..
-rw-r--r--@ 1 xjk staff 6.0K Mar 27 11:21 .DS_Store
-rw-r--r-- 1 xjk staff 838B Mar 30 13:38 Reading.go
-rw-r--r-- 1 xjk staff 553B Mar 27 13:12 URL.go
-rw-r--r-- 1 xjk staff 598B Mar 30 13:45 Writing.go
-rw-r--r-- 1 xjk staff 402B Mar 30 13:23 base64.go
-rw-r--r-- 1 xjk staff 447B Mar 31 13:28 commandLineFlags.go
-rwxr-xr-x 1 xjk staff 1.7M Mar 31 13:21 commonLineArgument
-rw-r--r-- 1 xjk staff 209B Mar 31 13:20 commonLineArgument.go
-rw-r--r-- 1 xjk staff 261B Apr 1 13:02 environmentVariables.go
-rw-r--r-- 1 xjk staff 298B Mar 31 13:15 lineFilters.go
-rw-r--r-- 1 xjk staff 384B Mar 27 13:04 number_parsing.go
-rw-r--r-- 1 xjk staff 189B Mar 27 13:18 sha.go
-rw-r--r-- 1 xjk staff 720B Apr 1 13:15 spawningProcess.go
-rwxr-xr-x 1 xjk staff 243B Mar 27 11:25 urllib001.p

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