To set an environment variable that is only available for the current PowerShell session, you can use the following command:

1. Using `$env:` Variable:```powershell$env:MyVariable = "Hello, World!"```This command sets the environment variable `MyVariable` to "Hello, World!" for the duration of the session. Once you close PowerShell, this variable will be lost.
2. Using `Set-Item` Cmdlet:```powershellSet-Item -Path Env:\MyVariable -Value "Hello, PowerShell!"```This command achieves the same result as the previous one, setting `MyVariable` to "Hello, PowerShell!" temporarily.

If you want to set an environment variable that persists across sessions and system restarts, you can use the following method:

1. Using .NET Method:```powershell[Environment]::SetEnvironmentVariable("MyVariable", "Hello, Persistent World!", "User")```In this example, the environment variable `MyVariable` is set to "Hello, Persistent World!" and will be available for the user across all sessions. You can change the last parameter to `"Machine"` to set it for all users, but this requires administrative privileges.

To check if your environment variable has been set correctly, you can use:```powershellecho $env:MyVariable```This command will display the value of `MyVariable` in the current session.By following these steps, you can easily manage environment variables in PowerShell, whether temporarily for a session or permanently for future use.

• View All Environment Variables: You can list all environment variables by using the command:```powershellGet-ChildItem Env:```Alternatively, you can use the alias `dir` or `ls`:```powershelldir Env:```
• Access a Specific Variable: To view the value of a specific environment variable, use:```powershell$env:VariableName```For example, to view the `PATH` variable:```powershell$env:PATH```

• Temporary Variables: To set an environment variable for the current session, use:```powershell$env:MyVariable = "MyValue"```This variable will be lost once the session is closed.
• Using Set-Item Cmdlet: You can also set an environment variable using the `Set-Item` cmdlet:```powershellSet-Item -Path Env:\MyVariable -Value "MyValue"```
• Persistent Variables: To create an environment variable that persists across sessions, use the .NET method:```powershell[Environment]::SetEnvironmentVariable("MyVariable", "MyValue", "User")```This command sets the variable for the user scope. You can also specify "Machine" for system-wide variables, but this requires administrative privileges.

• Process Scope: Variables set in the current PowerShell session are only available in that session.
• User Scope: Variables available to the user across sessions.
• Machine Scope: Variables available to all users on the machine.

• Environment variables are key-value pairs used by the operating system and applications to store configuration settings and system paths. They can be accessed and modified easily in PowerShell, making it a powerful tool for managing system configurations.By using these commands and understanding the scopes, you can effectively manage environment variables in PowerShell for your scripting and automation needs.

Environment variables are named values that can be used by the operating system and applications to retrieve information about the system configuration. They can point to important directories, such as the location of the Windows Temp folder, or provide information about the system, like the version of Windows or the number of processor cores available. There are two types of environment variables:

• User Variables: Specific to the current user account.
• System Variables: Apply to all users on the system.

1. Open System Properties:
   • Click the Windows icon in the bottom-left corner of your screen and type "Environment Variables" in the search bar. Select "Edit the system environment variables" from the results.
   • Alternatively, you can right-click on This PC or My Computer, select Properties, and then click on Advanced system settings. In the System Properties window, click on the Environment Variables button.
2. View and Edit Variables:
   • In the Environment Variables window, you will see two sections: User variables and System variables. You can select a variable and click Edit to change its value or click New to create a new variable.
   • For the Path variable, you can add new paths by clicking New and specifying the folder path. Each entry in the Path variable should be separated by a semicolon.

If you prefer using PowerShell, you can set environment variables without needing administrative rights. Here are some commands:

• To list all environment variables: `Get-ChildItem Env:`
• To get the value of a specific variable: `$Env:VARIABLE_NAME`
• To set a variable: `[Environment]::SetEnvironmentVariable("VARIABLE_NAME", "VALUE", "User")`.

• Caution: Changing environment variables can affect system behavior. Always double-check before making changes, especially to system variables.
• Administrative Rights: Some changes may require administrative privileges, especially when modifying system variables.By following these steps, you can effectively manage environment variables in Windows 10 to customize your system's behavior and improve your workflow.