How to Determine File Length in Go?

Determining File Length in Go

Question:

Despite exploring the golang.org/pkg/os/#File documentation, you're unable to locate a method for obtaining file length. Is this an oversight?

Answer:

The (*os.File).Stat() method can be used to retrieve a os.FileInfo value, which provides a Size() method. Here's how it's implemented:

fi, err := f.Stat()
if err != nil {
  // Handle error
}

fmt.Printf("The file is %d bytes long", fi.Size())

This code attempts to retrieve the file's information using Stat(), and if successful, it prints the file length using the Size() property of the os.FileInfo value.

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