System Calls
The standard I/O routines are actually higher level functions that call low level UNIX system calls
These system calls can be made directly for more low level programming #include <sys/file.h> int open(char *filename, int access, int mode); int lseek(int fd, int offset, int origin); int read(int fd, char *buffer, int k); int write(int fd, char *buffer, int k); mkdir (char *name, int mode); int rmdir(char *dir_name); chdir(char *dir_name);