Purpose: The purpose of this assignment is to write a shell

script with the name lab$4.$scr that will run various UNIX

commands and will redirect the output of the commands to

two output files with the filenames lab$4$out$1$ and lab$4$out$2.$

Note: The output files lab$4$out$1$ and lab$4$out$2$ must be passed

to the script as command line arguments. There should be no

reference to the filenames lab$4$out$1$ or lab$4$out$2$ in your script.

$*$ Steps $1-5$ listed below should be part of the lab$4.$scr script file.

$*$ All files must be contained within your lab$4$ directory.

$*$ Your script must contain comments with your name, course

number and your user id$.$

Create a directory with the name lab$4$ in your home directory

demonstrating use of the Keyword Shell Variable that contains the

value of your home directory.

Declare the local variable lab$4\_$dir with the value of the pathname

to your lab$4$ directory. Declare the GLOBAL variable LAB$4\_$DIR$2$ with

the value of the pathname to your lab$4$ directory.

Output file lab$4$out$1$ should contain the output

from the following Unix commands:

$*$ List all filenames in the $/$home$/$david$/$lab$4$

directory beginning with "host" that were created

on May $24.$

$*$ Display the value of the shell variable that contains

the search path for executables.

$*$ Declare the local variable lab$4$var with the value of the date in

the format mmddyy$.$ Use the touch command to create the filename

lab$4$test in your lab$4$ directory using the lab$4$var variable as a

file extension. $($i$.$e$.$ lab$4$test$\mathrm{.}021520)$

Output file lab$4$out$2$ should contain the output

from the following Unix commands:

$*$ Copy the lab$4.$readme file from $/$home$/$david to your

lab$4$ directory using the lab$4\_$dir variable. List

the file access permissions for all files in your

lab$4$ directory.

$*$ List variables set in your environment displaying

ONLY the variable lab$4\_$dir and its value.

$*$ List all files in your lab$4$ directory using the GLOBAL

variable LAB$4\_$DIR$2.$

Create a file in your lab$4$ directory with the filename lab$4.$out

that contains the contents of the lab$4$out$1$ and lab$4$out$2$ files.

can you give a detailed explanation and include screenshots?