Operating Systems questions need help

Log on to your Linux account and issue the command "strace pwd".

a) Explain the purpose of the strace utility. (See the man page for information).

b) Explain the purpose of the pwd utility.

c) How many system calls are executed by the pwd command? (See man page.)

d) What are the arguments to the final write() system call listed by strace? Explain the meanings of each argument. (Again see man page.)