SAPEVT is a tool, that can send out events to an SAP system from the operating system level. So. it is often used for interfaces.
SAP Kernel Programs
sapevt is a very interesting tool. It allows you to create events in the SAP system from the OS level. So, you can very easy "let the SAP system know", that you did something or want something to have done.
You can download the latest version of all the SAP Executables in the SAP Service Marketplace. As the binaries are different for each platform, you should have a look at the following link:
Download Executable Patches on the SAP Service Marketplace
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usage: sapevt event ¬-p param | ¬-t | pf=<profile> ! name=<Name> nr=<nn>