Query all unregistered domains

query-all-unregistered-domains.sh

#!/bin/bash
DOMAIN=me                       # domain suffix
LENGTH=3                        # length of domain
TIMEOUT="gtimeout 5"            # timeout command, can be gtimeout or timeout or empty
MATCH_STRING="Domain not found" # unregisterd string
CHARS=(a b c d e f g h i j k l m n o p q r s t u v w x y z)
# CHARS=(a b c d e f g h i j k l m n o p q r s t u v w x y z 0 1 2 3 4 5 6 7 8 9)
# CHARS=(0 1 2 3 4 5 6 7 8 9)

function find() {
    if [[ $($TIMEOUT whois $1 | grep -i "$MATCH_STRING") ]]; then
        echo $1 "available"
        echo $1 >>$DOMAIN.txt
    fi
}

function query() {
    local len=$1
    local prefix=$2

    if [[ $len -gt 0 ]]; then
        for i in ${CHARS[@]}; do
            echo $prefix$i.$DOMAIN
            query $(($len - 1)) $prefix$i
        done
    else
        find $prefix.$DOMAIN
    fi
}

query $LENGTH