简单，不易于使用的myls

    main.c 文件
  1 #include <stdio.h>
  2 #include <string.h>
  3 #include <stdlib.h>
  4 #include <glob.h>
  5 #include <error.h>
  6 #include <dirent.h>
  7 #include "myls.h"
  8
  9 void stat_attbute(struct stat *buf);
 10  int is_not_dir(char *name);
 11
 12 int main(int argc, char **argv)
 13 {
 14     int ch = 0;
 15     struct stat buf;
 16     char path[1024];
 17     DIR *dp = NULL;
 18     struct dirent * ret;
 19
 20     char *optstring = "-lia";
 21
 22     while(ch != -1)
 23     {
 24         ch = getopt(argc, argv, optstring);
 25
 26         if(argv[1] == NULL && ch == -1)
 27         {
 28                 ch = ‘m‘;
 29                 strcpy(path, ".");
 30         }
 31         else
 32             if(ch == 1)
 33
 34                 strcpy(path,argv[optind - 1]);
 35
 36         dp = opendir(path);
 37
 38
 39         switch(ch)
 40         {
 41
 42             case ‘l‘:
 43                 while(1)
 44                 {
 45                     ret = readdir(dp);
 46                     if(ret == NULL)
 47                     {
 48                         if(ret)
 49                         {
 50                             perror("readdir()");
 51                             closedir(dp);
 52                         }
 53                         break;
 54                     }
 55                     if(!is_not_dir(ret->d_name))
 56                         continue;
 57
 58                     if(stat(ret->d_name, &buf))
 59                     {
 60                         perror("stat()");
 61                         closedir(dp);
 62                     }
 63                     stat_attbute(&buf);
 64                     printf("%s\n",ret->d_name);
 65                 }
 66                 break;
 67             case ‘i‘:
 68                 while(1)
 69                 {
 70                     ret = readdir(dp);
 71                     if(ret == NULL)
 72                     {
 73                         if(ret)
 74                         {
 75                             perror("readdir()");
 76                             closedir(dp);
 77                         }
 78                         break;
 79                     }
 80                      if(!is_not_dir(ret->d_name))
 81                          continue;
 82                     if(stat(ret->d_name, &buf))
 83                     {
 84                         perror("stat()");
 85                         closedir(dp);
 86                         return -1;
 87                     }
 88                     stat_ino(&buf);
 89                     printf("%s\n",ret->d_name);
 90                 }
 91                 break;
 92
 93             case ‘a‘:
 94                 while(1)
 95                 {
 96                     ret = readdir(dp);
 97                     if(ret == NULL)
 98                     {
 99                         if(ret)
100                         {
101                             perror("readdir()");
102                             closedir(dp);
103                         }
104                         break;
105                     }
106                     printf("%10s  ",ret->d_name);
107                 }
108                     break;
109
110             case ‘m‘:
111                 while(1)
112                 {
113                     ret = readdir(dp);
114                     if(ret == NULL)
115                     {
116                         if(ret)
117                         {
118                             perror("readdir()");
119                             closedir(dp);
120                         }
121                         break;
122                     }
123                      if(!is_not_dir(ret->d_name))
124                          continue;
125                     printf("  %s",ret->d_name);
126                 }
127                 ch = -1;
128                 break;
129
130             case ‘?‘:
131                 printf("没有此选项%s\n",argv[optind - 1]);
132                 break;
133             default:
134                 break;
135         }
136
137     }
138
139
140
141     return 0;
142 }
143
144 void stat_attbute(struct stat *buf)
145 {
146
147     stat_file(buf);//文件类型
148     stat_mode(buf);//文件权限
149     stat_link(buf);//hard link
150     stat_usr(buf);//文件用户名
151     stat_gup(buf);//文件组用户名
152     stat_byte(buf);//文件字节大小
153     stat_time(buf);//文件最后保存时间
154
155 }
156
157 int is_not_dir(char *name)
158 {
159
160     if(name[0] == ‘.‘)
161         return 0;
162
163     return 1;
164 }
165
166 

           myls.h文件
  1 #ifndef __MYLS_H
  2 #define __MYLS_H
  3 #include <sys/types.h>
  4 #include <sys/stat.h>
  5 #include <fcntl.h>
  6 #include <unistd.h>
  7 #include <time.h>
  8 #include <grp.h>
  9 #include <pwd.h>
 10 void stat_file(struct stat *buf);//文件类型
 11 void stat_mode(struct stat *buf);//文件权限
 12 void stat_link(struct stat *buf);//hard link
 13 void stat_usr(struct stat *buf);//文件用户名
 14 void stat_gup(struct stat *buf);//文件组用户名
 15 void stat_byte(struct stat *buf);//文件字节大小
 16 void stat_time(struct stat *buf);//文件最后保存时间
 17 void stat_ino(struct stat *buf);//ino
 18 #endif

                   myls.c文件
  1 #include <stdio.h>
  2 #include "myls.h"
  3 void stat_file(struct stat *buf)//文件类型
  4 {
  5
  6     switch(buf->st_mode & S_IFMT)
  7     {
  8         case S_IFIFO :
  9             printf("p");
 10             break;
 11
 12         case S_IFCHR :
 13             printf("c");
 14             break;
 15
 16         case S_IFDIR :
 17             printf("d");
 18             break;
 19
 20         case S_IFBLK :
 21             printf("b");
 22             break;
 23         case S_IFREG :
 24             printf("-");
 25             break;
 26         case S_IFLNK :
 27             printf("l");
 28             break;
 29         case S_IFSOCK :
 30             printf("s");
 31             break;
 32     }
 33
 34
 35 }
 36 void stat_mode(struct stat *buf)//文件权限
 37 {
 38     if(buf->st_mode & S_IRUSR)
 39         printf("r");
 40     else
 41         putchar(‘-‘);
 42
 43     if(buf->st_mode & S_IWUSR)
 44         printf("w");
 45     else
 46         putchar(‘-‘);
 47
 48     if(buf->st_mode & S_IXUSR)
 49         printf("x");
 50     else
 51         putchar(‘-‘);
 52
 53     if(buf->st_mode & S_IRGRP)
 54         printf("r");
 55     else
 56         putchar(‘-‘);
 57
 58     if(buf->st_mode & S_IWGRP)
 59         printf("w");
 60     else
 61         putchar(‘-‘);
 62
 63     if(buf->st_mode & S_IXGRP)
 64         printf("x");
 65     else
 66         putchar(‘-‘);
 67
 68     if(buf->st_mode & S_IROTH)
 69         printf("r");
 70     else
 71         putchar(‘-‘);
 72
 73     if(buf->st_mode & S_IWOTH)
 74         printf("w");
 75     else
 76         putchar(‘-‘);
 77
 78     if(buf->st_mode & S_IWOTH)
 79         printf("x");
 80     else
 81         putchar(‘-‘);
 82         putchar(‘ ‘);
 83 }
 84 void stat_link(struct stat *buf)//hard link
 85 {
 86     printf("%ld ", buf->st_nlink);
 87 }
 88 void stat_usr(struct stat *buf)//文件用户名
 89 {
 90     struct passwd *pwd = NULL;
 91
 92     pwd = getpwuid(buf->st_uid);
 93
 94     printf("%s ",pwd->pw_name);
 95
 96 }
 97 void stat_gup(struct stat *buf)//文件组用户名
 98 {
 99     struct group *gnam = NULL;
100
101     gnam = getgrgid(buf->st_gid);
102
103     printf("%s ",gnam->gr_name);
104
105 }
106 void stat_byte(struct stat *buf)//文件字节大小
107 {
108     printf("%ld ",buf->st_size);
109
110 }
111 void stat_time(struct stat *buf)//文件最后保存时间
112 {
113     struct tm *times;
114     char buff[1024];
115
116     times = localtime(&buf->st_mtim.tv_sec);
117
118     strftime(buff, 1024, "%m月  %d %H:%M", times);
119     printf("%s ",buff);
120 }
121 void stat_ino(struct stat *buf)//ino
122 {
123     printf("%ld  ",buf->st_ino);
124 }
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原文地址：https://www.cnblogs.com/APUEsocket/p/10541511.html