How to extract domain name from url?

Question

How do I extract the domain name from a url using bash? like: http://example.com/ to example.com must work for any tld, not just .com

Answer 1

Instead of using regex to do this you can use python's urlparse:

 URL=http://www.example.com

 python -c "from urlparse import urlparse
 url = urlparse('$URL')
 print url.netloc"

You could either use it like this or put it in a small script. However this still expects a valid scheme identifier, looking at your comment your input doesn't necessarily provide one. You can specify a default scheme, but urlparse expects the netloc to start with '//' :

url = urlparse('//www.example.com/index.html','http')

So you will have to prepend those manually, i.e:

 python -c "from urlparse import urlparse
 if '$URL'.find('://') == -1 then:
   url = urlparse('//$URL','http')
 else:
   url = urlparse('$URL')
 print url.netloc"