Shell Programming and Scripting

I got a text file with the following information:
I need a script that (reads the file) asks the name and modifies his ip given by the user (new ip) and saves the edited information in the same file. I've been trying (I'm new to this) to use cut and grep but I've been unsuccessful.

Thx

Code:

 
sed 's/\([^;]*\);\([^;]*\);/\1 \2 /' file |while read n i r
do
echo "$n $i ? \c"
read i
echo "$n;$i;$r"
done

Narrative: sed get the first two ; separated fields and space delimit them, read the three fields into three variables, ask the question, get the answer, and write the new line out. No room for operator error, though. Maybe let them update it in msword on their PC?

Thx for the help but i cant make that code work (newbie). I made this one. It's still not working but i feel im close.

The part in red is giving me some errors.

Well, there are so many dangers trying to make an editor. First, save the prior file to a .date_HHMMSS extension. If you get a name, it should be all of the first field: "^$name;" and there should be just one [ $(grep -c ... ) = 1 ], before you take the old line out (grep -v . . . <old >new) of the old to make a new file, and put it on at the end with the old fields (echo . . . >>new ).

Code:

echo "Name"
read maq

set -- $(awk -F\; '/'"$maq"'/ {print $1,$2,$3,$4,$2}' $f)

after that, you can use them directly by $1,$2,...$5.

Code:

echo $1
echo $2
...
echo $5