在golang中获取文件并在列出的每一行之前运行命令

Question

Inside a golang program i want to source a file (in this case its .clean) which would look like this

$HOME/directory1
$HOME/directory1/.directory2
$HOME/directory3

and then run the rm -rf command before each directory. Does anyone know how to accomplish this?

Answer 1

You can do this using a bufio.Scanner.

Bold text added by me.

Scanner provides a convenient interface for reading data such as a file of newline-delimited lines of text. Successive calls to the Scan method will step through the 'tokens' of a file, skipping the bytes between the tokens. The specification of a token is defined by a split function of type SplitFunc; the default split function breaks the input into lines with line termination stripped. Split functions are defined in this package for scanning a file into lines, bytes, UTF-8-encoded runes, and space-delimited words. The client may instead provide a custom split function.

Example using os.RemoveAll():

package main

import (
    "bufio"
    "fmt"
    "log"
    "os"
)

func main() {
    f, err := os.Open(".clean")
    if err != nil {
        log.Fatal(err)
    }
    s := bufio.NewScanner(f)
    for s.Scan() {
        fmt.Println("Deleting:", s.Text())
        if err := os.RemoveAll(s.Text()); err != nil {
            log.Println(err)
        }
    }
    if err := s.Err(); err != nil {
        log.Fatal(err)
    }
}

Playground

Or, using Cmd.Run() from os/exec to run rm -rf:

package main

import (
    "bufio"
    "fmt"
    "log"
    "os"
    "os/exec"
)

func main() {
    f, err := os.Open("file.txt")
    if err != nil {
        log.Fatal(err)
    }
    s := bufio.NewScanner(f)
    for s.Scan() {
        fmt.Println("Deleting:", s.Text())
        cmd := exec.Command("rm", "-rf", s.Text())
        if err := cmd.Run(); err != nil {
            log.Println(err)
        }
    }
    if err := s.Err(); err != nil {
        log.Fatal(err)
    }
}

Playground