Final answer:
This question is about file copying in C and the use of command line arguments to specify block size.
Step-by-step explanation:
This question is related to operating systems and file copying in the programming language C. The goal is to write a program that copies a file. The template provided includes a parser for command line arguments that accepts arguments in the format '-b <blocksize>'. The '-b' parameter is optional and specifies the number of bytes to read/write with a single system call.