有什么办法可以在exec.Command中执行多个命令？

Question

I am trying to execute set of commands in Go using exec.Command(). Where I am trying to detach Gluster peer using Docker Exec.

fmt.Println("About to execute gluster peer detach")

SystemdockerCommand := exec.Command("sh", "-c", "docker exec ", "9aa1124", " gluster peer detach ", "192.168.1.1", " force")
var out bytes.Buffer
var stderr bytes.Buffer
SystemdockerCommand.Stdout = &out
SystemdockerCommand.Stderr = &stderr
err := SystemdockerCommand.Run()
if err != nil {
    fmt.Println(fmt.Sprint(err) + ": " + stderr.String())
}
fmt.Println("System Docker exec : " + out.String())

I was expecting a result as "no peer to detatch". But got exit status 1: "docker exec" requires at least 2 arguments.

Answer 1

Since you have used sh -c, the next parameter should be the full command or commands:

SystemdockerCommand := exec.Command("sh", "-c", "docker exec 9aa1124 gluster peer detach 192.168.1.1 force")

More generally, as in here:

cmd := exec.Command("/bin/sh", "-c", "command1 param1; command2 param2; command3; ...")
err := cmd.Run()       

See this example:

sh := os.Getenv("SHELL") //fetch default shell
//execute the needed command with `-c` flag
cmd := exec.Command(sh, "-c ", `docker exec 9aa1124 ...`)

Or this one, putting your commands in a string first:

cmd := "cat /proc/cpuinfo | egrep '^model name' | uniq | awk '{print substr($0, index($0,$4))}'"
out, err := exec.Command("bash","-c",cmd).Output()
if err != nil {
    return fmt.Sprintf("Failed to execute command: %s", cmd)
}