Packages used

flags package:  Command-line parsing.

path/filepath package: traverse or manipulate the filename paths.

bytefmt package: Human-readable byte formatted.

Before proceeding to the execution of the program, make sure to download the dependency.

go get -u code.cloudfoundry.org/bytefmt

package main  
  import (  
   "path/filepath"  
   "os"  
   "flag"  
   "fmt"  
   "code.cloudfoundry.org/bytefmt"  
  )  
  func walkpath(path string, f os.FileInfo, err error) error {  
   //fmt.Printf("%s with %d bytesn", path,f.Size())  
   fmt.Printf("%s with %s n", path,bytefmt.ByteSize(uint64(f.Size())))  
   return nil  
  }  
  func main() {  
   flag.Parse()  
   root := flag.Arg(0) // 1st argument is the directory location  
   filepath.Walk(root, walkpath)  
  }  

Output

 C:UserskarthikgitgithubGosrckarthikworld>go run readdirwalk.go ./  
 ./ with 4K  
 CoreOS- etcd 2.0.mp4 with 241.6M  
 employee.txt with 218B  
 readdirwalk.go with 471B  
 reverse-test.go with 309B  
  
 C:UserskarthikgitgithubGosrckarthikworld>go run readdirwalk.go .  
 . with 4K  
 CoreOS- etcd 2.0.mp4 with 241.6M  
 employee.txt with 218B  
 readdirwalk.go with 471B  
 reverse-test.go with 309B  

Tip: To install Go projects and download all the dependencies in one shot

go get ./...