hello, there are any way to delete the text into a file on the sd card without you need remove or delete the file.
* O_READ - Open for reading. * * O_RDONLY - Same as O_READ. * * O_WRITE - Open for writing. * * O_WRONLY - Same as O_WRITE. * * O_RDWR - Open for reading and writing. * * O_APPEND - If set, the file offset shall be set to the end of the * file prior to each write. * * O_CREAT - If the file exists, this flag has no effect except as noted * under O_EXCL below. Otherwise, the file shall be created * * O_EXCL - If O_CREAT and O_EXCL are set, open() shall fail if the file exists. * * O_SYNC - Call sync() after each write. This flag should not be used with * write(uint8_t), write_P(PGM_P), writeln_P(PGM_P), or the Arduino Print class. * These functions do character at a time writes so sync() will be called * after each byte. * * O_TRUNC - If the file exists and is a regular file, and the file is * successfully opened and is not read only, its length shall be truncated to 0.