#!/bin/sh
#
# watch_whois_record
# 
# AUTHOR:
#   Dan Harkless                                                    <opensource@
#   http://harkless.org/dan/software/                              harkless.org>
# 
# COPYRIGHT:
#   This file is Copyright (C) 2003 by Dan Harkless, and is released under the
#   GNU General Public License <http://www.gnu.org/copyleft/gpl.html>.
#
# USAGE:
#   % watch_whois_record <domain> <text_to_watch> [<whois_server>]
#
# EXAMPLE:
#   % watch_whois_record microsoft.com "expires on 03-May-2012" \
#   whois.networksolutions.com 
#
# DESCRIPTION:
#   There's a domain name that I'm interested in acquiring, and the WHOIS record
#   shows that it has expired, but trying to register the domain name fails.
#
#   This script, run from cron, will keep checking the WHOIS record to see if
#   the expiration line changes (either it'll disappear entirely if the
#   registrar's grace period expires, or it'll change to a future date if they
#   belatedly renew).
#
#   This script can also be useful if there's a domain to which you have a link
#   on your site which you aren't sure is permanently defunct or just deliquent
#   in its renewal.  You can have yourself notified as soon as the domain
#   expiration date (or any other piece of data) changes.
#
# DATE        MODIFICATION
# ==========  ==================================================================
# 2003-04-02  Removed the unnecessary use of a temp file, made the whois server
#             an optional parameter (now that smart whois clients are common),
#             and changed the unportable use of "traditional" fgrep's -s 
#             parameter into a redirect to /dev/null.
# 2000-09-18  Original.

if [ $# -lt 2 -o $# -gt 3 ]; then
    echo "Usage: watch_whois_record <domain> <text_to_watch> [<whois_server>]"
    exit 1
fi

if [ $# = 3 ]; then
    whois_server="-h $3"
fi

whois_output=`whois $whois_server $1`

if ! echo "$whois_output" | fgrep "$2" > /dev/null; then
    echo "$whois_output"
fi