ls(1)命令的实现

来源：互联网发布：maya软件配置要求编辑：程序博客网时间：2024/06/04 23:28

cpp

ubuntu server 14.04 测试通过

#include <stdio.h>#include <dirent.h>#include <stdlib.h>int main(int argc, char *argv[]){    DIR *dp;    struct dirent *dirp;    if(argc != 2){        printf("usage: ls directory_name\n");        exit(1);    }    if((dp = opendir(argv[1])) == NULL){        printf("can't open %s\n", argv[1]);        exit(1);    }    while((dirp = readdir(dp)) != NULL){        printf("%s\n", dirp->d_name);    }    closedir(dp);    exit(0);}

golang

package mainimport (    "fmt"    "os")func main() {    var (        directory_name string        count          int        err            error    )    if len(os.Args) == 1 {        if directory_name, err = os.Getwd(); err != nil {            fmt.Println(err)            os.Exit(1)        }    } else {        directory_name = os.Args[1]    }    f, err := os.Open(directory_name)    if err != nil {        fmt.Println(err)        os.Exit(1)    }    list, err := f.Readdir(-1)    f.Close()    if err != nil {        fmt.Println(err)        os.Exit(1)    }    for _, info := range list {        fmt.Println(info.Name())    }    count = len(list)    fmt.Println("总数:", count)    return}

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