Sometimes you need to run the safex program for the EEM environment.
E.G. in a post-install step of a patch.
The readme.pdf file of the patch, holds the syntax of that command with it's parameters.
For the ease of use, you then copy that command from within the .pdf file and paste it in the command prompt.
It then appears that the safex program does not recognize the parameters as such.
Copy/Paste from PDF files can pick up extra (usually hidden) characters, which prevent Safex from recognising the command.
Enter/type the command text in full, yourself (e.g. in notepad) and then copy&paste it onto the command prompt.
Now the safex program will run properly.