使用Powershell从FQDN获取域名

Question

I had been looking for a short code to do this for a while and finally figured it out myself. Thought I would share it.

$FQDN = "madeup.name.domain.co.in"

I would need the result as name.domain.co.in

Answer 1

An arguably cleaner solution would be

$FQDN.Substring($FQDN.IndexOf(".") + 1)

This gets the substring of $FQDN starting after the first . .

Answer 2

Code:

$hostname = $FQDN.Split('.')[0]
$Domain = $FQDN -replace "$hostname.",""

$Domain will have the result.

Hope this helps

Answer 3

If you want to get the "registrableDomain" you can use this function: https://github.com/ili101/PowerShell/blob/master/Get-Domain.ps1

Get-Domain madeup.name.madeup.domain.co.in

Output: domain.co.in

Answer 4

I like this approach from @Rohin Sidharth:

$hostname = $FQDN.Split('.')[0]
$Domain = $FQDN -replace "$hostname.",""

You can also get the $hostname from the $env variable:

$env:computername 

If you are running on the server in question, then the replace mechanism will provide the domain even if the name of the server has a '.' in it.

Answer 5

Regex , to return first segment composed of Letter, digit, '-' and '_'

"made-up1.name.madeup.domain.co.in" -replace('(^[\w-_\d]+)\.(.*)','$1')

return made-up1

DomainName with $2

"made-up1.name.madeup.domain.co.in" -replace('(^[\w-_\d]+)\.(.*)','$2')

return name.madeup.domain.co.in