IF-THEN Statement used with grep not fuctioning in UNIX Script - unix

Question

I have posted the same code for another question recently. I was helped with that but when trying to implement an If-Then statement, it returned erroneous results. So within this topic I will have 2 questions.
First Question:
When performing a search within a file, how do you implement the search so uppercase or lower case has no basis on returning the desired record?
Second Question:
In my If-Then statement no matter what I type it shows the else part of the If-Then Statement. For example, the name Smith is in the file, but no matter what I type "Smith" or "smith" yields the same result as "echo "Error: $last_name is not in file"".
Additionally:
This has to be written in korn shell programming.
The code is as follows:
#Gather search parameter
read last_name
if grep -Fxq "$last_name" $1
then
while IFS=: read c1 c2 c3 c4 c5 c6 c7 rest ; do
case "$c1" in
"$last_name" )
echo -e "Last Name: $c1\nFirst Name: $c2\nCity: $c3\nState: $c4\nClass: $c5\nSemester Enrolled: $c6\nYear First Enrolled: $c7\n\n"
;;
esac
done < $1
else
echo "Error: $last_name is not in file"
fi
;;
Any insight into the coding of this would be much appreciated.
EDIT:
User Input 1
User input: Smith
Expected Output:
Last Name: Smith
First Name: John
....
Actual Output:
Error: Smith is not in file
User Input 2
User input: smith
Expected Output:
Error: smith is not in file
Actual Output:
Error: smith is not in file

Answer 1

You are using grep's -x option: your user input must exactly match a complete line. I assume you don't want this behaviour.
Use -i for case insensitivity
read "last_name?Enter a last name: "
matches=0
grep -Fi "$last_name" "$1" |
while IFS=: read c1 c2 c3 c4 c5 c6 c7 rest; do
echo -e "Last Name: $c1\nFirst Name: $c2\nCity: $c3\nState: $c4\nClass: $c5\nSemester Enrolled: $c6\nYear First Enrolled: $c7\n\n"
((matches++))
done
if (( matches == 0 )); then
echo "Error: $last_name is not in file"
fi
In this case, I'm looping over the grep output directly, assuming that more than one line may match
Of course, it's misleading to be searching for "last name" with grep -- I could enter a city or a year, or a colon, and grep could find a match. If you're interested in this line of thought, let me know.
To test for string equality of the first field, awk would be a good choice
read "last_name?Enter a last name: "
awk -v name="$last_name" '
tolower($1) == tolower(name) {
print "Last Name:", $1
print "First Name:", $2
print "City:", $3
print "State:", $4
print "Class:", $5
print "Semester Enrolled:", $6
print "Year First Enrolled:", $7
matches++
}
END {if (matches == 0) print "No matches for:", name }
' "$1"