Shell Programming and Scripting

if [[ "$DIV" = @(ter|bom|hre|nte|mol) ]]
then
 echo "something"
else
 echo "Please enter a correct division"
fi

case ${word:-""}
in
   ter|bom|hre|nte|mol)
      echo "something"
   ;;
   *|"")
      echo "Please enter a correct division"
   ;;
esac

$ cat script
#!/bin/ksh

DIV="mol"

if [[ "$DIV" = @(ter|bom|hre|nte|mol) ]]
then
 echo "something"
else
 echo "Please enter a correct division"
fi

$ ./script
something

$ cat script
#!/bin/ksh

DIV=$1

if [[ "$DIV" = @(ter|bom|hre|nte|mol) ]]
then
 echo "something"
else
 echo "Please enter a correct division"
fi

$ ./script ter
something
$ ./script hre
something
$ ./script mol
something
$ ./script yoda
Please enter a correct division

$ ksh --version
  version         sh (AT&T Research) 93t+ 2010-02-02

if [[ $# < 1 ]]
then
 echo "No parameters received"
else
  while getopts :d opt

if [[ $# < 1 ]]
then
 echo "No parameters received"
else
  while getopts :d: opt