PHONE BOOK ENTRIES help.

this is the script that i have for the phone book entry:
*****************************************
****************************************
if [ "$#" -ne 0 ]
then
lu "$@"
exit
fi
validchoice=""
until [ -n "$validchoice" ]
do


echo "s - search for an entry"
echo "a - add an entry"
echo "u - update phone directory"
echo "r - remove an entry"
echo "x - exit"


read choice
case "$choice"

in


s) echo "Enter name to look up: \c"
read name
grep "$name" /home/ce435a14/assign2/phonedir;
echo $fnamelname ":" $businessnumber ":" $homenumber ":" $comments
validchoice=TRUE;;


a) echo "Enter first and last name: \c"
read fnamelname
echo "Enter business phone number: \c"
read businessnumber
echo "Enter home phone numer: \c"
read homenumber
echo "Enter description: \c"
read comments
echo $fnamelname ":"$businessnumber " (h) :" $homenumber "(o) :" $comments >> /home/ce435a14/assign2/phonedir
echo "Done !"
validchoice=TRUE;;


u) vi /home/ce435a14/assign2/phonedir ;;


r) echo "Enter name to be removed: \c"
read name
grep -v "$name" phonedir > /tmp/phonedir;
mv /tmp/phonedir phonedir;
validchoice=TRUE;;


x) echo "Goobye. \c"
echo ""
validchoice=TRUE;;


*) echo "You have entered an invalid option, please eneter a valid option [s,a,u,x]" ;;
esac
done
********************************************************************************************

this scrpt can add entries, update entries, search for entries and also quits properly.

Need assistance on :

- when searching for names display only the name, phones and comments,
-delete entries from the phoenbook but using the command "SED" i used the command grep to delete entry it works but i dontknow how to use "SED"
-add changes to create "phonedir" file, if it doesnt exist
-add a label entry to the phone menu (I|L) that will search for a pattern in the phone directory and displa the name and address in the label format:
for ex. for the user JOHN it shud show :
John Jones
5 Front Street
Ottawa, Ontario
K2S 2S4
-finally, performn multiple actions under the same option of selected menu. exit selected option to go back to a main menu whenuser enters an empty string or ^C (CTL+C) or ^D (ctrl+D). display # of searces or additions or deletions that were performed.

can someone please help me with these questions.. i hope someone can.. i really need you help..please can you take a lil bit of ur time and help me.. thankyou so much..

more then assistance, you need a good shell book.
i will give you an exemple (last time in my life, i am tired to do this)



# nota
# the ending exit is in sh not needed (default is 0), anyway always
# give an exit status to your codes, this will help you later
# spaces in most of progs are IGNORED, so use it to make your
# code readable by humans, not for machine
# THE notation:

#
# are absolutely the SAME, which can YOU better read ?
# columning is very easy + efficient way to SEE errors

# i inserted the same ERROR in this 2 case
# in first one, you need to read the code
# in second, it's simply flamboyant



# ---- first try to get it out, then scroll to see below