Xu li danh sach sinh vien trong shellscipts

#!/bin/bash
while [ TRUE ]
do
echo        "MENU"
echo '[1] Tao danh sach'
echo "2) In danh sach"
echo "3) Tim kiem user"
echo "4) Them user"
echo "5) Xoa user"
echo "0) Thoat"
read -p "ban can thuc hien: " chon
echo ""
clear
case $chon in
1)
read -p "nhap so sinh vien: " n
for i in `seq 1 $n`
do
read -p "nhap ten sinh vien $i: "  ten
read -p "nhap nam sinh: " nam
read -p "nhap que quan: " que
read -p "nhap chuyen nganh: " nganh
echo "$ten     $nam  $que   $nganh">>danhsach.txt
done
;;
2)
echo " Danh sach sinh vien "
cat danhsach.txt
;;
3)
echo "tim kiem user"
read -p "nhap ten user can tim: " ten
cat danhsach.txt | awk '$1 ~/'$ten'/{print$0}'
;;
4)
echo "them user"
read -p "nhap thong tin user thu $i: " ten
read -p "nhap nam sinh: " nam
read -p "nhap que quan: " que
read -p "nhap chuyen nganh: " nganh
echo "$ten   $nam  $que  $nganh">>danhsach.txt
;;
5)
echo "xoa user"
read -p "nhap user can xoa: " ten
cat danhsach.txt | grep -v $ten>danhsach.txt
echo "da xoa xong"
;;
0)
exit
esac
done