Show Filetypes and frequency of S3 Bucket Object List

main.go

package main

import (
        "fmt"
        "io/ioutil"
        "strings"
)

/*
Save Output of aws command to file with `filelist.txt` and run 
        go run ./main.go
*/


func main() {
        filetypes := map[string]int{}
        data, err := ioutil.ReadFile("fileslist.txt")
        if err != nil {
                panic(err)
        }
        stringdata := string(data)
        lines := strings.Split(stringdata, "\n")
        for _, v := range lines {
                parts := strings.Split(v, ".")
                suffix := parts[len(parts)-1]
                if filetypes[suffix] == 0 {
                        filetypes[suffix] = 1
                } else {
                        filetypes[suffix] = filetypes[suffix] + 1
                }
        }

        for k, v := range filetypes {
                fmt.Printf("%v : %v\n", k, v)
        }
}