Question $1.$ Calculate average waiting time for the following table using shortest job first.Question $1.$ Calculate average waiting time for the following table using shortest job first.

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$\begin{array}{cc}\text{P}\text{r}\text{o}\text{c}\text{e}\text{s}\text{s}& \text{B}\text{u}\text{r}\text{s}\text{t}\text{t}\text{i}\text{m}\text{e}\\ P1& 5\\ P2& 2\\ P3& 7\\ P4& 6\\ P5& 3\end{array}$

a$)$ In the shell command window, display today's date with day of the week, month, date, and year.

b$)$ Use four file data, concatenate them and merge into one single file displaying all four files data.by website JSLinux