自己動手寫shell命令之ls -R1fF

標籤：unix環境進階編程   shell   

    ls命令的R參數代表遞迴的列出所有子檔案夾中的所有檔案，1表示每一行只顯示一個檔案或檔案夾，f表示不排序即輸出，F表示在每項的輸出的最後根據其檔案類型相應的加上*/=>@|字元。通過c語言實現ls -R1fF命令的效果，其原始碼如下：

#include <stdio.h>#include <sys/types.h>#include <dirent.h>#include <sys/stat.h>#include <pwd.h>#include <grp.h>#include <string.h>void listdir(char *);char get_type(struct stat *);int main(int argc,char * argv[]){if(argc == 1)listdir(".");else{int index = 1;while(argc > 1){listdir(argv[index]);index++;argc--;}}return 0;}void listdir(char * dirname){DIR * dir;struct stat info;//char pointer[];struct dirent * direntp;if((dir = opendir(dirname)) != NULL){printf("%s:\n",dirname);while((direntp = readdir(dir)) != NULL){char absolute_pathname[255];strcpy(absolute_pathname,dirname);strcat(absolute_pathname,"/");strcat(absolute_pathname,direntp->d_name);lstat(absolute_pathname,&info);printf("%s",direntp->d_name);printf("%c\n",get_type(&info));}printf("\n");rewinddir(dir);while((direntp = readdir(dir)) != NULL){if(strcmp(direntp->d_name,".") == 0 || strcmp(direntp->d_name,"..") == 0)continue;char absolute_pathname[255];strcpy(absolute_pathname,dirname);strcat(absolute_pathname,"/");strcat(absolute_pathname,direntp->d_name);lstat(absolute_pathname,&info);if(S_ISDIR((&info)->st_mode))listdir(absolute_pathname);}}}char get_type(struct stat * info){if(S_ISCHR(info->st_mode))return '*';if(S_ISDIR(info->st_mode))return '/';if(S_ISSOCK(info->st_mode))return '=';if(S_ISBLK(info->st_mode))return '>';if(S_ISLNK(info->st_mode))return '@';if(S_ISFIFO(info->st_mode))return '|';return ' ';}

自己動手寫shell命令之ls -R1fF