Answer the following short questions: $(1\mathrm{.}5$ mark$)$

a$)$ What is the meaning of "grep" in Unix?

b$)$ How can you display the contents of a file in Unix?

c$)$ How do you create a new directory in Unix?

d$)$ What is the command used to remove a file in Unix?

e$)$ How can you display only the first $10$ lines of a file in Unix?

f$)$ What does the $"$wc$"$ command do in Unix?