sudo !!
If you ran a unix command and then realized you should have run it as a superuser, you can run the following command out to execute your last command as sudo:
sudo !!
If you ran
/usr/sbin/useradd myNewUser
but got a permission error:
-bash: /usr/sbin/useradd: Permission denied
You can run sudo !! and the shell will actually run
sudo /usr/sbin/useradd myNewUser
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