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In computing, runas (a compound word, from “run as”) is a command in the Microsoft Windows line of operating systems that allows a user to run specific tools and programs under a different username to the one that was used to logon to a computer interactively. [1]
PowerShell is a task automation and configuration management program from Microsoft, consisting of a command-line shell and the associated scripting language.Initially a Windows component only, known as Windows PowerShell, it was made open-source and cross-platform on August 18, 2016, with the introduction of PowerShell Core. [5]
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Individual settings for users on a system are stored in a hive (disk file) per user. During user login, the system loads the user hive under the HKEY_USERS key and sets the HKCU (HKEY_CURRENT_USER) symbolic reference to point to the current user. This allows applications to store/retrieve settings for the current user implicitly under the HKCU key.
If the user is an administrator, the current user's name is already filled in, and only needs to enter their password. The name can still be modified to run as another user. The application only requires authentication once, and is requested at the time the application needs the privilege.
The user part is basically a mirror of the machine data, but it does not initially exist in new user profiles. Whenever a user logs on, Active Setup checks if each machine part component GUID is present in the user part. If not, the component’s command is executed and the component's GUID is added in the user part.
The pushd ('push directory') command saves the current working directory to the stack then changes the working directory to the new path input by the user. If pushd is not provided with a path argument , in Unix it instead swaps the top two directories on the stack, which can be used to toggle between two directories.
Also, scheduled tasks are executed in their own session, instead of the same session as system services or the current user. Ability to wake up a machine remotely or using BIOS timer from sleep or hibernation to execute a scheduled task or run a previously scheduled task after a machine gets turned on.