Go language self-study series | golang standard library os module - file directory related

Video source: Station B "Golang entry to project combat [2021 latest Go language tutorial, no nonsense, pure dry goods! Continuing to update...]"

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The os standard library implements a platform (operating system) independent programming interface.

package main

import (
    "fmt"
    "os"
)

// 创建文件
func createFile() {
    f, err := os.Create("test.txt")
    if err != nil {
        fmt.Printf("err: %v\n", err)
    } else {
        fmt.Printf("f: %v\n", f)
    }
}

// 创建目录
func createDir() {
    // 创建单个目录
    /*  err := os.Mkdir("test", os.ModePerm)
        if err != nil {
            fmt.Printf("err: %v\n", err)
        } */
    err := os.MkdirAll("test/a/b", os.ModePerm)
    if err != nil {
        fmt.Printf("err: %v\n", err)
    }
}

// 删除目录
func removeDir() {
    /*  err := os.Remove("test.txt")
        if err != nil {
            fmt.Printf("err: %v\n", err)
        } */

    err := os.RemoveAll("test")
    if err != nil {
        fmt.Printf("err: %v\n", err)
    }
}

// 获得工作目录
func getWd() {
    dir, err := os.Getwd()
    if err != nil {
        fmt.Printf("err: %v\n", err)
    } else {
        fmt.Printf("dir: %v\n", dir)
    }
}

// 修改工作目录
func chWd() {
    err := os.Chdir("d:/")
    if err != nil {
        fmt.Printf("err: %v\n", err)
    }
    fmt.Println(os.Getwd())
}

// 获得临时目录
func getTemp() {
    s := os.TempDir()
    fmt.Printf("s: %v\n", s)
}

// 重命名文件
func renameFile() {
    err := os.Rename("test.txt", "test2.txt")
    if err != nil {
        fmt.Printf("err: %v\n", err)
    }
}

// 读文件
func readFile() {
    b, err := os.ReadFile("test2.txt")
    if err != nil {
        fmt.Printf("err: %v\n", err)
    } else {
        fmt.Printf("b: %v\n", string(b[:]))
    }
}

// 写文件
func writeFile() {
    s := "hello world"
    os.WriteFile("test2.txt", []byte(s), os.ModePerm)
}

func main() {
    // createFile()
    // createDir()
    // removeDir()
    // getWd()
    // chWd()
    // renameFile()
    // readFile()
    // writeFile()
    // getTemp()
}