Go – How to pass a slice as a variadic input

go

I have a function func more(... t). I'm wondering if it's possible to use a slice to populate a list of arguments ... .

I'm trying to solve the following program. Basically to mimic a normal shell which receives the command as a string.
Command function requires a "list" of arguments and I don't see how I can convert a string into a such list 

    import "os/exec"
    import "strings"
    func main(){
        plainCommand  := "echo hello world"
        sliceA := strings.Fields(plainCommand)
        cmd := exec.Command(sliceA)
    }

Best Answer

The Go Programming Language Specification

Passing arguments to ... parameters

If f is variadic with final parameter type ...T, then within the function the argument is equivalent to a parameter of type []T. At each call of f, the argument passed to the final parameter is a new slice of type []T whose successive elements are the actual arguments, which all must be assignable to the type T. The length of the slice is therefore the number of arguments bound to the final parameter and may differ for each call site.

Package exec

func Command

func Command(name string, arg ...string) *Cmd

Command returns the Cmd struct to execute the named program with the given arguments.

The returned Cmd's Args field is constructed from the command name followed by the elements of arg, so arg should not include the command name itself. For example, Command("echo", "hello")

For example,

package main

import (
    "fmt"
    "os/exec"
)

func main() {
    name := "echo"
    args := []string{"hello", "world"}
    cmd := exec.Command(name, args...)
    out, err := cmd.Output()
    if err != nil {
        fmt.Println(err)
    }
    fmt.Println(string(out))
}

Output:

hello world
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