Retrieving File Position in Go: Uncovering File.Position

In Go, retrieving the position of a file is an essential task for managing file input/output. In many programming languages, the fgetpos function is used for this purpose. However, in Go, the equivalent functionality can be found through the Seek method.

To find the file offset or position, you can use Seek to move the file cursor to zero bytes from the current position. This operation returns the resulting position, which is likely to be the absolute position you're seeking.

package main

import (
    "fmt"
    "io"
    "log"
    "os"
)

func main() {
    file, err := os.Open("test.txt")
    if err != nil {
        log.Fatal(err)
    }

    offset, err := file.Seek(0, io.SeekCurrent)
    if err != nil {
        log.Fatal(err)
    }

    fmt.Printf("File position: %d\n", offset)
}

In this example, the Seek method is invoked with two arguments: 0, which indicates that we want to move the cursor zero bytes from the current position, and io.SeekCurrent, which specifies that we want to move relative to the current cursor position. The result is stored in the offset variable, which represents the absolute position within the file.