This may help...
$ /cygdrive/c/Program\ Files/Windows\ Defender/MpCmdRun.exe /h Windows Defender Command Line Utility (c)2006-2008 Microsoft Corp Use this tool to automate and troubleshoot Windows Defender
[...]
$ /cygdrive/c/Program\ Files/Windows\ Defender/MpCmdRun.exe /h Windows Defender Command Line Utility (c)2006-2008 Microsoft Corp Use this tool to automate and troubleshoot Windows Defender
[...]