shell script for menu driven program to see the contents of /etc/passwd, to see the list of users, to see present working directory or to exit.

Code:
echo enter
echo 1 to see the contents of /etc/passwd
echo 2 to see list of users
echo 3 to see present working directory
echo 4 exit
echo enter your choice
read n
case $n in
 1)   ls /etc ;;
 2)   ls /home;;
 3)   pwd;;
 4)  exit;;
*) echo enter the choice as 1,2,3or4;;
esac

Output:
[ty2011330@localhost ~]$ sh  file13.sh
enter
1 to see the contents of /etc/passwd
2 to see list of users
3 to see present working directory
4 exit
enter your choice
2
administrator  pritam   ty11305  ty11313  ty11321  ty11329  ty11337  ty11345
amita          pritam1  ty11306  ty11314  ty11322  ty11330  ty11338  ty11346
dipti          shital   ty11307  ty11315  ty11323  ty11331  ty11339  ty11347
exam5154       shital1  ty11308  ty11316  ty11324  ty11332  ty11340  ty11348
enter your choice
1
a2ps.cfg               inittab                   quotatab
a2ps-site.cfg          inputrc                   racoon
acpi                   iproute2                  raddb

enter your choice
3
/home/tybsc
enter your choice
4





2.



ans=Y
while [ $ans = "Y" ]
do
echo "          MENU"
echo "1 . Query on product"
echo "2 . Query on customer"
echo "0 . Exit"
echo "enter ur choice : "
read ch
case "$ch" in
1) echo "Enter product number :"
  read pno
  grep $pno masterdata
  echo "Query on other product : "
  read ans
  if(test $ans = "Y")
  then
      continue
  fi;;
2) echo "Enter customer number :"   
   read cno
   grep $cno transdata;;
0) exit;;
*) echo "Invalid choice. Try again..."
esac
done