Question

Let’s say I want to run ‘ls’ in a go program, and store the results in a string. There seems to be a few commands to fork processes in the exec and os packages, but they require file arguments for stdout, etc. Is there a way to get the output as a string?

Answer 1

Edit: This answer is obsolete. Please see Fatih Arslan’s answer below.

---

Use exec.Run by specifying Pipe as the stdout (and stderr if you want). It will return cmd, which contains an os.File in the Stdout (and Stderr) fields. Then you can read it using for example ioutil.ReadAll.

Example:

package main

import (
    "exec";
    "io/ioutil";
)

func main() {
    if cmd, e := exec.Run("/bin/ls", nil, nil, exec.DevNull, exec.Pipe, exec.MergeWithStdout); e == nil {
        b, _ := ioutil.ReadAll(cmd.Stdout)
        println("output: " + string(b))
    }
}