Shell – Execute command prompt file (.cmd) from within a PowerShell script

The problem is that the file you're trying to execute has an alternate file stream that indicates that it came from the Internet. To make the message go away, you merely need to delete the stream. Sysinternals has a free utility called streams.exe that can easily do this for you. (It is important to note, as indicated in the message, that if the file did come from the public Internet, you should be cautious when executing it and make sure you understand completely what it's going to do.)

Once you have streams.exe, the command will be:

streams.exe -d C:\nst\win7.ps1

Viewing the alternate stream from the command line can be tricky, however, notepad++ can open them. On my system, the command would be:

"c:\Program Files (x86)\Notepad++\notepad++.exe" "e:\temp\test.ps1:Zone.Identifier:$DATA"

Also, if you're curious, the stream giving you all the grief contains:

[ZoneTransfer]
ZoneId=3

Defined ZoneIds are:

Local machine = 0
Intranet      = 1
Trusted       = 2
Internet      = 3
Restricted    = 4

cd in Powershell an alias for Set-Location which is cd, and if the Git command line executable is in your path, you can call it from Powershell as well.

cd C:\path\to\myrepo.git\
git pull

or

Set-Location C:\path\to\myrepo.git\
Git pull

The second solution is more idiomatic for Powershell. And remember, if the path to your repo contains spaces, you must put it between quotes.