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

func main() {
// 1) os.StartProcess //
/*********************/
/* Linux: */
	env := os.Environ()
	procAttr := &os.ProcAttr{
   			Env: env,
   			Files: []*os.File{
   				os.Stdin,
   				os.Stdout,
   				os.Stderr,
   			},
   		}
	// 1st example: list files 
	pid, err := os.StartProcess("/bin/ls", []string{"ls", "-l"}, procAttr)  
	if err != nil {
			fmt.Printf("Error %v starting process!", err)  // 
			os.Exit(1)
	}
	fmt.Printf("The process id is %v", pid) 
	// 2nd example: show all processes
	pid, err = os.StartProcess("/bin/ps", []string{"-e", "-opid,ppid,comm"}, procAttr)  
	if err != nil {
			fmt.Printf("Error %v starting process!", err)  // 
			os.Exit(1)
	}
	fmt.Printf("The process id is %v", pid) 
/* Output 1st:
The process id is &{2054 0}total 2056
-rwxr-xr-x 1 ivo ivo 1157555 2011-07-04 16:48 Mieken_exec
-rw-r--r-- 1 ivo ivo    2124 2011-07-04 16:48 Mieken_exec.go
-rw-r--r-- 1 ivo ivo   18528 2011-07-04 16:48 Mieken_exec_go_.6
-rwxr-xr-x 1 ivo ivo  913920 2011-06-03 16:13 panic.exe
-rw-r--r-- 1 ivo ivo     180 2011-04-11 20:39 panic.go
*/
	
// 2) exec.Run //
/***************/
// Linux:  OK, but not for ls ?
// cmd := exec.Command("ls", "-l")  // no error, but doesn't show anything ?
// cmd := exec.Command("ls")  		// no error, but doesn't show anything ?
	cmd := exec.Command("gedit")  // this opens a gedit-window
	err = cmd.Run()
	if err != nil {
		fmt.Printf("Error %v executing command!", err) 
		os.Exit(1)
	}
	fmt.Printf("The command is %v", cmd)
// The command is &{/bin/ls [ls -l] []  <nil> <nil> <nil> 0xf840000210 <nil> true [0xf84000ea50 0xf84000e9f0 0xf84000e9c0] [0xf84000ea50 0xf84000e9f0 0xf84000e9c0] [] [] 0xf8400128c0}
}
// in Windows: uitvoering: Error fork/exec /bin/ls: The system cannot find the path specified. starting process!
	

