哈哈，这样就没问题啦。
下面，我们来点高级的，如查询 nginx 主进行的PID号：
ps -eaf|grep "nginx: master"|grep -v "grep"|awk '{print $2}'
package main
import (
"os"
"os/exec"
)
func main() {
run1()
run2()
run3()
}
func run1() {
cmd := exec.Command("ls", "|", "wc", "-l")
cmd.Stdout = os.Stdout
cmd.Stderr = os.Stderr
cmd.Start()
cmd.Run()
cmd.Wait()
}
func run2() {
c1 := exec.Command("ls")
c2 := exec.Command("wc", "-l")
c2.Stdin, _ = c1.StdoutPipe()
c2.Stdout = os.Stdout
c2.Stderr = os.Stderr
c2.Start()
c1.Run()
c2.Wait()
}
func run3() {
c1 := exec.Command("ps", "-eaf")
c2 := exec.Command("grep", `"nginx: master"`)
c3 := exec.Command("grep", "-v", `"grep"`)
c4 := exec.Command("awk", `'{print $2}'`)
c2.Stdin, _ = c1.StdoutPipe()
c3.Stdin, _ = c2.StdoutPipe()
c4.Stdin, _ = c3.StdoutPipe()
c4.Stdout = os.Stdout
c4.Stderr = os.Stderr
c4.Start()
c3.Start()
c2.Start()
c1.Run()
c4.Wait()
}