Shell Programming and Scripting

I am writing a script where it uses yum to install. I need to read the user input for yum ie "y or n". If the user types "y", the script should continue running. If the user types "n" then the whole script should be terminated.

line1
line2
yum install package
line3
line4

From above, line1 and line2 are executed and after the yum line, if the user input is "n" then dont execute the rest of the lines and terminate the script by it own..

Code:

line1
line2
echo "Do you want to install (y/n)"
read answer
if [ "$answer" ne "y" ]
     exit 1
fi
yum install package
line3
line4

Thank you.

But my need is that the line "yum install package" should run and according to the user input to this command, the script should run or terminate. I hope I am clear enough.

Code:

if [ "$answer" ne "y" ]
     exit 1
fi

exit is used to terminate the script (if the user didnt choose "y")

Sorry, I was not clear enough.

Say line1 and line2 are executed and then the line "yum install package" is executed. User needs to input "y" or "yes" to install the package and "n" or "no" to quit the yum install. If the user input "y" or "yes" the script should continue as such, ie yum will install package and after that line3 and line4 of script is executed.
Now if the user input "n" or "no" for the yum install step, the yum will not install the package and the script should be terminated and line3 and lin4 should not be executed.

This should work, i don't have linux to try now, the assumption is that when user gives no to yum it returns with non-zero status. Try if this works.

Code:

line1
line2
yum install pakage
if [ $? -ne 0 ]
then
 exit 1
fi
line3
line4