Question: how to check if a kb is installed using powershell?
Answer: First use the Windows Update tool.
Second way – Use DISM.exe.
Type dism /online /get-packages.
Type dism /online /get-packages | findstr KB2894856 (KB is case sensitive)
Third way – Use SYSTEMINFO.exe.
Type SYSTEMINFO.exe.
Type SYSTEMINFO.exe | findstr KB2894856 (KB is case sensitive)