avrdude - how to only write to device?
According to AVRDUDE documentation, 2.1 Option Descriptions, 
the command-line option "-V" disables automatic verify check when uploading data.

-V
Disable automatic verify check when uploading data.


Note that this is a capital V not lowercase v, which enables verbose output.

-v
Enable verbose output. More -v options increase verbosity level.


Normally it's correct for avrdude to verify after writing, to ensure that the operation completed successfully. The only reason to disable the verification check is to save firmware loading time, on a setup that you have already deemed reliable.