Storing Course Information Course information will be stored in text files.

Assignment $1$: Shell Scripting

Page $1$ of $6$

$1.$ 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

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$)$ESL English as a Second Language Literacy in a Second Language MWF $8/20/2412/13/24352$