Go (golang) program to execute a bash for loop.

bashFor.go

package main

import (
        "bytes"
	"fmt"
	"log"
	"os/exec"
	"strings"
)

type Result struct {
	cmd    string
	result interface{}
}

func bashCmd(s string) []string {

	cmd := exec.Command("/bin/bash", "-c", s)
	stdout, err := cmd.StdoutPipe()
	if err != nil {
		log.Fatal(err)
	}
	stderr, err := cmd.StderrPipe()
	if err := cmd.Start(); err != nil {
		log.Fatal(err)
	}

	max := 3
	lines := make([]string, max)
	count := 0

	bb := bytes.NewBuffer([]byte{})
	_, err = bb.ReadFrom(stdout)
	for {
		s, err := bb.ReadString('\n')
		if err != nil {
			break
		}

		lines[count] = s
		count++
		if count+1 >= max {
			max = max*2 + 10
			newLines := make([]string, max)
			copy(newLines, lines)
			lines = newLines

		}

//		fmt.Printf("%v\n", strings.Fields(s))
	}

	be := bytes.NewBuffer([]byte{})
	_, err = be.ReadFrom(stderr)

	for {
		s, err := be.ReadString('\n')
		if err != nil {
			break
		}
		fmt.Printf("%v\n", strings.Fields(s))
	}

	return lines[0:count]
}

func main() {

	v := bashCmd("for i in 1 2 3; do echo ${i}; done")
	fmt.Printf("v=%v len(v)=%v\n", v, len(v))

}