Golang : File system scanning

Problem :

How to scan all the files located inside a root directory in Golang?

Solution :

Use the filepath.Walk function. See codes below :

 package main

 import (

 func scan(path string, f os.FileInfo, err error) error {
 fmt.Printf("Scanned %s with size %d bytes\n", path, f.Size())
 return nil

 func main() {

 if len(os.Args) != 2 {
 fmt.Printf("USAGE : %s <target_directory> \n", os.Args[0])

 dir := os.Args[1] // 1st argument is the directory location

 err := filepath.Walk(dir, scan)

 if err != nil {


Sample output :

./scanfilesystem /Users/

Scanned /Users/ with size 170 bytes

Scanned /Users/.localized with size 0 bytes

Scanned /Users/Shared with size 136 bytes

Scanned /Users/Shared/.localized with size 0 bytes

Scanned /Users/Shared/SC Info with size 68 bytes

Scanned /Users/sweetlogic with size 8194 bytes

By Adam Ng

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