Whois Command in Unix,Linux

#!/bin/bash
# Does a 'whois domain−name' lookup on any of 3 alternate servers:
# ripe.net, cw.net, radb.net
# Place this script, named 'wh' in /usr/local/bin
# Requires symbolic links:
# ln −s /usr/local/bin/wh /usr/local/bin/wh−ripe
# ln −s /usr/local/bin/wh /usr/local/bin/wh−cw
# ln −s /usr/local/bin/wh /usr/local/bin/wh−radb
if [ −z "$1" ]
then
echo "Usage: `basename $0` [domain−name]"
exit 65
fi
case `basename $0` in
# Checks script name and calls proper server
"wh" ) whois $1@whois.ripe.net;;
"wh−ripe") whois $1@whois.ripe.net;;
"wh−radb") whois $1@whois.radb.net;;
"wh−cw" ) whois $1@whois.cw.net;;
* ) echo "Usage: `basename $0` [domain−name]";;
esac
exit 0