An execution policy is the feature of PowerShell that specifies the conditions under which PowerShell loads the configuration files and run the scripts.
On a Windows operating system, we can set the execution policy for the current user, local computer, or for a specific session. Execution policies for the Current user and the local computer are stored in the registry, and for a specific session, execution policy is stored only in the memory, which is lost when the session is closed.
On a non-Windows operating system, the default execution policy is unrestricted. And this policy cannot be unchanged.
PowerShell Execution Policies
The following are the PowerShell execution policies:
- AllSigned
- Bypass
- RemoteSigned
- Restricted
- Undefined
- Unrestricted
AllSigned
- Only those scripts can run, which are signed by a trusted publisher with a digital signature.
- Before running the scripts, this policy prompts you a confirmation that you trust the publisher or not.
Bypass
- In this policy, nothing is blocked.
- There are no warnings, or no prompts are provided.
- Bypass policy is mainly designed for those configurations in which a script of PowerShell is built into a larger application.
RemoteSigned
- It is the default execution policy for the Windows Server computers.
- This policy requires the digital signature from the trusted publishers on the configuration files and the scripts. These files and scripts are downloaded from the internet that includes emails and instant messaging programs.
- This execution policy does not require the digital signature on those scripts which are written on the local computers.
Restricted
- This execution policy is available by default for Windows client computers.
- It does not allow to run the scripts but permits the individual commands.
Undefined
- No execution policy is defined in the current scope.
Unrestricted
- It is a default execution policy for the non-windows Computers.
- This policy executes those scripts which are unsigned.
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