Display All The Text Files From A Directory Using C

DESCRIPTION:

• This program get the directory path from the user and display all the text files available in the directory.

• We should add dirent.h header file to accomplish this program.
 

PROGRAM:

#include <string.h>
#include <dirent.h>
#include <string.h>
const char *only_txt (const char *);

int main (int argc, char *argv[])
{
    DIR *directory;
    struct dirent *file;    
    directory = opendir (argv[1]);
    int directory_length = strlen(argv[1]);
    if (directory != NULL){
        while (file = readdir (directory)){
            if( !strcmp((only_txt (file->d_name)), ".txt") )
                      puts (file->d_name);
        }
        (void) closedir (directory);
      }
      else
        perror ("Not able to open the directory\n");
    return 0;
}

/**load only .txt file**/

const char *only_txt (const char *filespec)
{
    char *file = strrchr (filespec, '.');
        if (file == NULL)
            file = "";
    return file;
}

COMPILE:

    gcc -o out scan.c

RUN:

• Pass the directory name with the path as argument to the program

        ./out /home/sujin/directory

OUTPUT:

      test.txt

   README.txt

      file.txt

 

CONCLUSION:

 

   Changing ".txt" to any type file extension, you can customize this program for file type you like.