Friday, 7 August 2015

Powershell Get Environment variable from Remote machine

We can find and list the environment variables using the .NET class [Environment]. The following command list all the environment variables in local machine.
[Environment]::GetEnvironmentVariables()
We can also list only computer specific environment variables or user specific environment variables by using below commands
[Environment]::GetEnvironmentVariables("Machine")
[Environment]::GetEnvironmentVariables("User")
Instead of listing all the environment variables, we can get the value of specific environment variable by using the function "[Environment]::GetEnvironmentVariable".
[Environment]::GetEnvironmentVariable("ComputerName")

Get Environment variable from Remote machine:

We can get an environment variable from remote machine by running the above commands using Invoke-Command. Before proceed, we should enable powershell remoting to run remote commands. Read this article : How to enable Powershell Remoting

Syntax of remote powershell command:

Invoke-Command -ComputerName $Target -ScriptBlock { $COMMAND } -Credential $USERNAME
$Target - The name of the computer to connect.
$COMMAND - The powershell command to run in remote computer.
$USERNAME - The user account to run the command as on the remote computer. You will be prompted to enter a password for the username. The Credential parameter is optional one.

The following command gets the name of the remote machine.
Invoke-Command -ComputerName "ESVR01" -ScriptBlock {[Environment]::GetEnvironmentVariable(“ComputerName”)}
The below command gets the "Temp" directory path of the remote computer "ESVR01".
Invoke-Command -ComputerName "ESVR01" -ScriptBlock {[Environment]::GetEnvironmentVariable(“Temp”,”Machine”)}
The below command gets the "Temp" directory path for the user "Kevin" in the remote machine "ESVR01".
Invoke-Command -ComputerName "ESVR01" -ScriptBlock {[Environment]::GetEnvironmentVariable(“Temp”,”User”)} -Credential Kevin

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