Questions are referring to commands in a Linux Virtual Machine terminal and using C language.

1. Give brief, precise answers.

(e) Mark each word as an executable utility (EU), a C library function (LF), or a system call (SC):

date ____

ls _____

read _____

fork _____

exit _____

isspace _____

_exit _____

dup2 _____

printf _____

getchar _____

(f) (Buffer size) Describe briefly and precisely the main reason why an I/O intensive user program or a stdio library function will suffer in performance when using a very small buffer.

(g) How many processes will be created in total (including the initial parent process) by the following code fragment? Explain your answer. Assume N to be a positive const int.

for (k = 0; k < N; k++) {

fork();

}