wildcard DNS record checker

wild.sh

#!/bin/sh
# Usage: bash wild.sh <example.com>  
# Repalce <example.com> with domain you want to check

# Random word loginc from http://www.unixcl.com/2008/05/generate-random-words-in-linux.html

WORDFILE="/usr/share/dict/words"
NUMWORDS=10

#Number of lines in $WORDFILE
tL=`awk 'NF!=0 {++c} END {print c}' $WORDFILE`

for i in `seq $NUMWORDS`
do
	rnum=$((RANDOM%$tL+1))
	line=$(sed -n "$rnum p" $WORDFILE)
	# try random work as subdomian for given domain name
	host $line.$1
done