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"Sudo !!" invokes previously executed command with administrator privileges in *nix shell. Is there an equivalent in PowerShell?

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$^ is a variable that expands to the last executed Powershell command.

You can run a command as another user using runas, so the following works:

runas /user:domain\administrator $^

To shorten that up a bit, you can do some magic with aliases. Take a look at this Technet article for more info.

EDIT: One caveat - $^ only executes the first command in a pipeline or multi-command line. If you need to redo an entire command that is peppered with pipes or semicolons, use Invoke-History instead (which defaults to the last full command in its entirety).

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Actually, $^ is the first token of the previous command. If I dot-source a script with . ./foo.ps1 then $^ is .. This also means that arguments are not contained. Doing anything that exceeds a single token will not work this way. – Joey May 17 '11 at 17:49
ok, does it ask for password after that ? I am trying to avoid embedding plaintext password in my script. – Albert Widjaja May 18 '11 at 0:48
Yes, it does. Unless you run the script as an administrator, you'll need to provide credentials to do anything that requires administrator privileges. You may want to look into something like Kixtart to tokenize an embedded password – Hyppy May 18 '11 at 11:23
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