Segger debuggers and software allow programming from the command line. Product information is available below.
-https://www.segger.com/jflash.html
-https://www.segger.com/jlink-flash-download.html
You can also refer to the following documents for how to use JFlash on the command line.
-https://www.segger.com/admin/uploads/productDocs/UM08003_JFlash.pdf 

Please also check the Silicon Labs community site.