For this assignment, you will use bash to create a simple course catalog for administrators to update the details of each course offered by their department. The system will store basic information about each course, allowing the user to create, read, update, and delete them.

This assignment requires only the utilities used so far in the lecture notes. Do not use sed, awk.

Course information will be stored in text files.

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

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

Assignment $1$: Shell Scripting

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

by the extension $.$crs $($notice that the text file does not end in $.$txt$.$ Does that need to be

accounted for?$).$

A course file consists of exactly five 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$)$

Example file named esl$3053.$crs

Your program should consist of seven bash files with the following names $($case sensitive$)$:

$$ assign$1.$bash $-$ the main file which is initially invoked

$$ create.bash $-$ logic for the create option

$$ read.bash $-$ logic for the read option

$$ update.bash $-$ logic for the update option

$$ delete.bash $-$ logic for the delete option

$$ enroll.bash $-$ logic for the enrollment option

$$ total.bash $-$ logic for the total option