How to implement wc in golang

The wc command is a very commonly used command, used to count the number of characters, words, lines and other information in the file. On a Linux or Unix terminal, you only need to use "wc filename" to count the detailed information of the file. So how do we implement this function in golang?

First, we need to create a file and write some sentences into the file. Then we read the contents of the file and count the number of characters, words, lines and other information. The code is as follows:

package main

import (
    "bufio"
    "fmt"
    "os"
    "strings"
)

func main() {
    fileName := "test.txt" // 文件名

    // 打开文件
    file, err := os.Open(fileName)
    if err != nil {
        panic(err)
    }
    defer file.Close()

    // 初始化变量
    wordCount := 0 // 单词个数
    lineCount := 0 // 行数
    charCount := 0 // 字符数

    // 逐行读取文件内容
    scanner := bufio.NewScanner(file)
    for scanner.Scan() {
        lineCount++ // 行数加1

        // 统计单词数量
        words := strings.Fields(scanner.Text()) // 将每行的内容按照空格划分
        wordCount += len(words)                 // 累加单词个数

        // 统计字符数量
        charCount += len(scanner.Text())
    }

    // 输出统计结果
    fmt.Printf("lines:%d，words:%d，chars:%d\n", lineCount, wordCount, charCount)
}

As you can see, the entire code is very concise and clear. It is mainly implemented by reading the file content, dividing words, and counting the number of characters. You can run it to see if the output is as expected. Of course, the program can be further improved to make its functions more complete.

Summary

Through this example, we can learn how to read and write files in golang, and how to perform string processing and statistics. In actual development, we can modify and improve the program according to our own needs, and can combine features such as goroutine and channel to achieve more efficient file processing operations.

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