package main

import (
    "io"
    "log"
    "math/rand"
    "os/exec"
)

var letters = []rune("abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ")

func randSeq(n int) string {
    b := make([]rune, n)
    for i := range b {
        b[i] = letters[rand.Intn(len(letters))]
    }
    return string(b)
}

func main() {
    for i := 8190; i < 8195; i++ {
        log.Println("length: ", i)
        data := randSeq(i)

        command := exec.Command("/bin/cat")

        pipe, err := command.StdinPipe()
        if err != nil {
            log.Fatal("can not get pipe from command: ", err)
        }

        log.Println("writing to pipe")
        _, err = io.WriteString(pipe, data)
        if err != nil {
            log.Fatal("can not write to pipe: ", err)
        }
        log.Println("finished writing to pipe")
        pipe.Close()

        _, err = command.CombinedOutput()
        if err != nil {
            log.Fatal("problem while running command: ", err)
        }

    }
}