Open Explorer from command console or powershell

I was reading this post about how to open command line from an explorer window at the same path. This is very helpful to speed up works a little bit.

In order to open command line in current directory you just need to type 'cmd' in address bar. Also you can type 'powershell' if you need powershell.

However, in reverse if you want to open windows explorer from command line this is what you need to type in command line:

explorer .

note that if you miss explorer then it will open your user's documents folder.
And for powershell the command is:

ii .

note: ii is alias for invoke-item.