Loop help...

Shell Programming and Scripting
1

Hi, I'm starting to learn about shell scripts.

The following is my basic script...

echo "Please enter your first name: \c" 
read  firstname 
echo "Please enter your last name: \c" 
read  lastname 
echo "Your name is $firstname $lastname. Is that correct?" 
select BOOLEAN in Yes No 
do 
if [[ -z "$BOOLEAN" ]]
then
echo "Incorrect choice. Choose again!"
else
echo "Welcome $firstname $lastname"
break
fi
done

My problem is that when it comes to the choosing 'Yes' or 'No', if I select NO, the code will continue as if I selected YES. However, if I select NO, I want the code to keep asking the user to retype their name until they say YES.

Can someone help me? Thanks.

2 
firstname=""
lastname=""
enter()
{
echo "Please enter your first name: \c" 
read  firstname 
echo "Please enter your last name: \c" 
read  lastname 
export lastname
export firstname
}

while true
do 
 enter
 echo "Your name is $firstname $lastname. Is that correct?" 
 read BOOLEAN 
 if [[ -z "$BOOLEAN" ]]
 then
   echo "Incorrect choice. Choose again!"
   continue
 fi
 if [[ "$BOOLEAN" = "No" ]] ; then
    continue
 fi
done
# you get here  when   okay
echo "Welcome $firstname $lastname"
3

This looks like homework, so I am not going to give you an answer, but since you at least try to come up with a script, I'll give you a pointer.

Look into "while" loops, as in "while $ANSWER equals no, keep asking the questions". Any response other than "no" will break the loop. Look into the man pages for your shell.

4

Thanks Jim

@System_Shock: This isn't homework, and I actually wanted advice on how to do loops i.e. the proper structure that I need to follow.