#If the entered variable is empty:
if [ -z $n ];
echo "No month entered. Displaying even months."
for (( x=2 ; x<=12 ; x=x+2 ));
cal $x 2022
#The following regex matches any variable composed entirely of digits from beginning (^) to end (+$)
#If the entered variable does not match this pattern.
#The =~ allows regex comparison in Bash.s
if [[ ! $n =~ $re ]];
echo "$n is not a number."
#Check to see if n is less than one or greater than 12.
elif [[ $n -lt 1 || $n -gt 12 ]];
echo "$n is not a month."
echo "Month: $n"
echo "Remaining months: $next"
#Now use the -A/-n flag with cal to print remaining months in 2022.
cal -n $next $n 2022