Under your home directory, create a directory called $$Proj$\mathrm{.}3\_$ID$\_$Sec#$($example

Proj$\mathrm{.}3\_1230123\_$sec$1),$ and underneath it$,$ do the following: Write a shell script called myproj that,

when executed, displays the following four choices:

$($Your script should work on your own created files and

directories if they are needed$)$

Welcome Message

Write a shell script that prints a welcome message when the user logs in$.$ It should display $$Good

morning$/$Good afternoon$/$Good evening$,$ depending on when the user logs in$.$

$.$

When the myproj script is running, the welcome script displays the message automatically that displays the

following Menu, as shown below:

Good afternoon Muard Njoum

Please Choose one of the following options:

Directories:

$1)$ Change Permission for All Directory.

$2)$ Print all empty directories.

Files

$3)$ Change Permission for All Files

$4)$ Delete Duplicated files

Computer Science Department$-$ Faculty of Engineering and Technology

Linux OS Lab $-$ Comp $311$

Due Date: Wednesday $05/06/2024,$ before $5$:$00$ PM

Submission at Server

Projects $3.$ All answers must be from Labs $(1-11)$ ONLY.

ANY STUDENT WHO USES A COMMAND NOT IN THE LAB MANUAL OR AI TOOLS

WILL NEVER BE GRADED, AND HE OR SHE WILL RECEIVE THE PROPER

ACADEMIC PUNISHMENT.

$//)$

$()//$

YOUR Work must be tested on your machine $($Laptop$)$ Before passing the

Project.

Report:

$5)$ Count and display all files that contain the same word.

$6)$ Count the number of files that have the same name inside different directories.

Exit $7)$ Display a Goodbye message to the host

Clarification of ALL Scripts

$1.$ Directories:

$1)$ Change Permission for All Directory.

Write a shell script, chmodAllDirectories, that will change the permissions of all directories inside a given leading

directory. The command chmodAllDirectories newpermission maindirecroty should set a new permission to all

directories inside a given leading directory. The script should set a new permission for all $$directories$$ inside the given

directory.

If there is no argument or the main directory is not a directory, the script should print an error message to stderr and

exit.

Sample

chmodAllDirectories $600$ students

$2)$ Print all empty directories.

Write a shell script printEmptyDirectories maindirectory to print all empty directories as a full path. The

command printEmptyDirectories directory should only print all empty directories inside the given argument

directory.

Note: du command cannot be used in writing this script

If there is no argument or the main directory is not a directory, the script should print an error message to stderr and

exit.

Sample

$./$printEmptyDirectories $/$home$/$students$/$u$1200735$

$/$home$/$students$/$u$1200735/$mydir

$/$home$/$students$/$u$1200735/$dir$1$

$....$

$/$home$/$students$/$u$1200735/$test

$...$

$2.$ Files:

$3)$ Write a shell script, removeX, that will remove x permission of a given file from a given set of directories. The

command removeX file$1$ d$1$ d$2$ d$3..$dn removes the execution property of file$1$ inside that is laying inside d$1$ d$2$

d$3...$dn directories. If there is no argument, or if file$1$ is not a regular file or directory$1$ is not a directory, then the

script should print an error message to stderr and exit.

$4)$ Delete all duplicate files

Write a shell script to deleteDuplicate that deletes all files $($Keep one and remove the other$)$ that are a copy of a

given file. The command deletes replication f$1$ f$2...$ fn should remove all the files f$2$ through fn that are exact

copies of f$1.$ Exact means that the file name and size are the same.

Sample:

$($Assume that the midterm file in directory dir$1$ has another copy inside directory dir$2)$

$./$deleteDuplication dir$1$ dir$2$

File midterm has been deleted from the dir$2$ directory.

$...$

If there aren$$t two arguments or dir$1$ and dir$2$ are not a directory, the script should print an appropriate error message

to stderr and exit.

$3.$ Report:

$5)$ Count and display all files that contain the exact word:

Write a countWord script that accepts as many arguments as possible $($up to $8)$: the word to search for and a list

of directories. The script should display all files with their directories.

Your script should print an error if:

$$ The first argument is not a type of regular file

$$ The number of arguments is less than two.

Sample:

$./$countWord Computer Comp$311$ Comp$433$ Comp$438$

The Word $$Computer$$ appears $4$ times in the following Files with the

corresponding lines

$/$Comp$311/$midterm$.$doc line $10$

$/$Comp$311/$resume$.$txt line $5$

$/$Comp$433/$technology$.$txt$.$ line $3$

$/$Comp$438/$Myfiles$.$html line $25$

$6)$ Count the number of files that have the same name inside different directories.

Write a countFiles script that accepts two directories as arguments: the script should display all files wi