转到Go中文件中的特定行

Question

In Go is it possible to jump to particular line number in a file and delete it? Something like linecache in python.

I'm trying to match some substrings in a file and remove the corresponding lines. The matching part I've taken care of and I have an array with line numbers I need to delete but I'm stuck on how to delete the matching lines in the file.

Answer 1

I wrote a small function that allowing you remove from a file a specific line.

package main

import (
    "io/ioutil"
    "os"
    "strings"
)

func main() {
    path := "path/to/file.txt"
    removeLine(path, 2)
}

func removeLine(path string, lineNumber int) {
    file, err := ioutil.ReadFile(path)
    if err != nil {
        panic(err)
    }

    info, _ := os.Stat(path)
    mode := info.Mode()

    array := strings.Split(string(file), "
")
    array = append(array[:lineNumber], array[lineNumber+1:]...)
    ioutil.WriteFile(path, []byte(strings.Join(array, "
")), mode)
}