$1.$ Files will be stored inside a directory called data within the same directory as your script.

$2.$ Each file will be named based on the combination of a department code and a course number,

which consists of two or three letters followed by an integer with exactly four digits, followed by

the extension $.$crs$.$

$3.$ A course file consists of exactly these lines:

$$ dept$\_$code $($two or three letter abbreviation$)$ dept$\_$name $($string with probable whitespace$)$

$$ course$\_$name $($string with probable whitespace$)$

$$ course$\_$sched $($string consisting precisely of either $$MWF$$ or $$TH$)$ course$\_$start $($string

with no whitespace$)$ course$\_$end $($string with no whitespace$)$ course$\_$hours $($credit hours,

unsigned integer$)$ course$\_$size $($enrolled students, unsigned integer$)$

$*$ Department names may contain whitespace. You should account for names with multiple tokens

$($e$.$g$.,$ESL English as a Second Language$=$ dept$\_$code $=$ESL$,$ and dept$\_$name $=$English

as a Second Language$)$

$4.$ Example file named esl$3053.$crs

ESL English as a Second Language

Literacy in a Second Language

MWF $8/20/2412/13/24352$

Script Execution

When the script is run, the following should occur. All script output should appear exactly as it

appears below.

$1.$ Upon running your script, the user should be presented with the following menu:

Enter one of the following actions or press CTRL$-$D to exit.

C $-$ create a new course record

R $-$ read an existing course record

U $-$ update an existing course record

D $-$ delete an existing course record

E $-$ update enrolled student count of existing course

T $-$ show total course count

$2.$ The user then enters a one$-$character action $($upper or lowercase$),$ leading to one of the following.

$$ C: a course is created

$($a$)$ From the terminal, read the following one at a time:

i$.$ Department code $($two$-$to$-$three character string$)$

ii$.$ Department name $($string possibly containing whitespace$)1.$ Files will be stored inside a directory called data within the same directory as your script.

$2.$ Each file will be named based on the combination of a department code and a course number,

which consists of two or three letters followed by an integer with exactly four digits, followed by

the extension $.$crs$.$

$3.$ A course file consists of exactly these lines:

$$ dept$\_$code $($two or three letter abbreviation$)$ dept$\_$name $($string with probable whitespace$)$

$$ course$\_$name $($string with probable whitespace$)$

$$ course$\_$sched $($string consisting precisely of either $$MWF$$ or $$TH$)$ course$\_$start $($string

with no whitespace$)$ course$\_$end $($string with no whitespace$)$ course$\_$hours $($credit hours,

unsigned integer$)$ course$\_$size $($enrolled students, unsigned integer$)$

$*$ Department names may contain whitespace. You should account for names with multiple tokens

$($e$.$g$.,$ESL English as a Second Language$=$ dept$\_$code $=$ESL$,$ and dept$\_$name $=$English

as a Second Language$)$

$4.$ Example file named esl$3053.$crs

ESL English as a Second Language

Literacy in a Second Language

MWF $8/20/2412/13/24352$

Script Execution

When the script is run, the following should occur. All script output should appear exactly as it

appears below.

$1.$ Upon running your script, the user should be presented with the following menu:

Enter one of the following actions or press CTRL$-$D to exit.

C $-$ create a new course record

R $-$ read an existing course record

U $-$ update an existing course record

D $-$ delete an existing course record

E $-$ update enrolled student count of existing course

T $-$ show total course count

$2.$ The user then enters a one$-$character action $($upper or lowercase$),$ leading to one of the following.

$$ C: a course is created

$($a$)$ From the terminal, read the following one at a time:

i$.$ Department code $($two$-$to$-$three character string$)$

ii$.$ Department name $($string possibly containing whitespace$)$

iii. Course number $($integer$)$

iv$.$ Course name $($string possibly containing whitespace$)$

v$.$ Course schedule $($string in $\{$MWF$,$TH$\})$

vi$.$ Course start date $($string with slashes$)$

vii. Course end date $($string with slashes$)$

viii. Course credit hours $($unsigned integer$)$

ix$.$ Initial course enrollment $($unsigned integer$)$

$($b$)$ Using the values entered by the user, create a new file in the data folder based on the

instructions above.

$($c$)$ Update data$/$queries$.$log by adding the following line:

$[$date$]$ CREATED: dept$\_$code course$\_$num course$\_$name

where date is the output from the date command and dept$\_$code, course$\_$num, and

course$\_$name are the corresponding values.

$($d$)$ If the course already exists, print the following error and continue with the script. The

script should accept all seven inputs before checking if the record exists.

ERROR: course already exists

$$ R: read an existing course$$s information

$($a$)$ Prompt the user for a course department and course number: $($e$.$g$.,$cs $3424)$

Enter a department code and course number:

$($b$)$ Search for the specified course using the provided department and number $($e$.$g$.,$cs

$3424).$

$($c$)$ Print the course information in the following format:

Course department: dept$\_$code dept$\_$name

Course number: course$\_$num

Course name: course$\_$name: