{"id":73,"date":"2010-01-23T05:17:44","date_gmt":"2010-01-23T05:17:44","guid":{"rendered":"http:\/\/poojanwagh.opalstacked.com\/techblog\/?p=73"},"modified":"2010-01-23T05:26:09","modified_gmt":"2010-01-23T05:26:09","slug":"bash-script-to-search-for-3-letter-domains","status":"publish","type":"post","link":"https:\/\/tech.poojanblog.com\/blog\/hosted-web\/bash-script-to-search-for-3-letter-domains\/","title":{"rendered":"Bash script to search for 3-letter domains"},"content":{"rendered":"

Here it is for the .us<\/code> TLD:
\n
\n#!\/bin\/bash<\/p>\n

tld=”us”<\/p>\n

for k in 0 1 2 3 4 5 6 7 8 9 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; do<\/p>\n

whois — “${k}.${tld}” | egrep “Domain Name|Not found”<\/p>\n

for l in – 0 1 2 3 4 5 6 7 8 9 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; do<\/p>\n

whois — “${k}${l}.${tld}” | egrep “Domain Name|Not found”<\/p>\n

for m in 0 1 2 3 4 5 6 7 8 9 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; do<\/p>\n

whois — “${k}${l}${m}.${tld}” | egrep “Domain Name|Not found”
\n done
\n done
\ndone
\n<\/code><\/p>\n

And here it is for the .nu<\/code> TLD:
\n
\n#!\/bin\/bash
\nfor k in 0 1 2 3 4 5 6 7 8 9 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; do<\/p>\n

whois “${k}.nu” | grep “ASCII”<\/p>\n

for l in 0 1 2 3 4 5 6 7 8 9 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; do<\/p>\n

whois “${k}${l}.nu” | grep “ASCII”<\/p>\n

for m in 0 1 2 3 4 5 6 7 8 9 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; do
\n whois “${k}${l}${m}.nu” | grep “ASCII”
\n done
\n done
\ndone
\n<\/code><\/p>\n

You’ll note that the expression being grep<\/code>ed for is different between the two: there’s no universal method of detecting the existence\/non-existence of domains that works for all TLD’s.<\/p>\n