Binary selection mechanism similar to Facemash.

binsel.go

package main

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

func run(imgs chan string, out chan string) {
	for i := range imgs {
		cmd := exec.Command("feh", "-.", "-B", "black", i)
		err := cmd.Run()
		if err != nil {
			log.Fatal(err)
		}
		out <- i
	}
}

func main() {
	pics := os.Args[1:]

	c := make(chan string, len(pics))
	k := make(chan string)
	go run(c, k)
	go run(c, k)

	c <- pics[0]
	for i := 1; i < len(pics); i++ {
		c <- pics[i]
		<-k
	}
	fmt.Println(<-k)
}

I was trying to create a program to help me pick a picture of many, and it was soo easy in Go, I was very surprised. I tried before in C++, Python, and D, and found it very awkward. Considering that this is one of my first programs in Go, I really was surprised that I managed it.