I don't think you can modify the above text, but you can have it automatically print your own text too, you would just need to edit your powershell shortcut to always launch with
The way you do this is by editing your Power Shell Profile
To find your profile you simply just type
$profile and hit return and it will show you the full path to the profile script. The profile may or may not exist, but it will return the path that power shell will attempt to look in first.
Test-Path $profile will tell you if the profile exists or not.
Once you create the profile script at the correct location it will run everything in the script every time you start up power shell. So to get what you wanted you would need to create a profile with the following
Write-Host 'Powershell' $PsVersionTable.PSVersion '-' (Get-date)
Write-Host 'Greetings Professor Falken. Shall we play a game?'
However, you may hit a snag if you just do that, you will likely get a error with something similar the following
File C:\Users\Scott\Documents\WindowsPowerShell\Microsoft.PowerShell_profile.ps1 cannot be loaded because the execution
of scripts is disabled on this system. Please see "get-help about_signing" for more details.
At line:1 char:2
+ . <<<< 'C:\Users\Tami\Documents\WindowsPowerShell\Microsoft.PowerShell_profile.ps1'
+ CategoryInfo : NotSpecified: (:) , PSSecurityException
+ FullyQualifiedErrorId : RuntimeException
If you get an error like that read the help file by typing
get-help about_signing so you can either set it to open unsigned scripts1 or change the setting to only allow signed scripts and sign the script yourself when you are done.
Once you get it all working every time you start powershell with
-nologo it will look like
Powershell 2.0 - 9/15/2013 2:41:42 PM
Greetings Professor Falken. Shall we play a game?
1: I set my machine to
RemoteSigned which only requires a signature if the script has the "from another computer" flag set.