Best practices for file renaming in Go language

When using the os.Rename() function to complete file renaming, follow the following best practices to improve efficiency: ① Avoid renaming across partitions or disks; ② Ensure that the target file does not exist; ③ Use temporary files (for large files) ; ④ Use goroutine (for renaming a large number of files).

Best practices for efficient file renaming in Go

Using os.Rename() in Go Function is the standard way to accomplish the task of file renaming. This function requires two parameters: the current file path and the new file path. Here is the basic syntax for using os.Rename():

package main

import (
    "os"
)

func main() {
    err := os.Rename("old_file.txt", "new_file.txt")
    if err != nil {
        // 处理错误
    }
}

In order to achieve efficient file renaming, here are some best practices to follow:

• Avoid renaming across partitions or disks: os.Rename() The function cannot rename files across partitions or disks. If you need to move files across partitions or disks, use the io.Copy() and os.Remove() functions.
• Make sure the target file does not exist: Before using os.Rename(), please make sure the target file does not exist. Otherwise, the rename operation fails and returns an error.
• Use temporary files: For large files, consider using temporary files for renaming. This avoids creating overly large temporary data structures.
• Use goroutine: For a large number of file renaming operations, you can consider using goroutine to complete these operations concurrently. This can improve overall performance.

Practical case:

The following is an example of using the os.Rename() function to rename all files in a folder:

package main

import (
    "fmt"
    "os"
)

func main() {
    files, _ := os.ReadDir(".")
    for _, file := range files {
        if file.IsDir() {
            continue
        }
        newFileName := fmt.Sprintf("%s_renamed", file.Name())
        err := os.Rename(file.Name(), newFileName)
        if err != nil {
            // 处理错误
        }
    }
}

This program will traverse the current directory, rename all non-directory files, and add the "_renamed" suffix to the new file names.

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