avrdude: no programmer has been specified on the command line or the config file
Specify a programmer using the -c option and try again

Arduino Uno :o

You have provided no Details of what you were trying to do, but you want us to help?
Have you read the instructions on when and how to post to this Forum?
Did you try to Google the error? If you had, you would have found many Posts right here on this Forum with tips on how to solve your Problem. You would have been done in ten minutes instead of waiting two hours for us to solve it for you.
Sorry for the criticism, but fact remains fact.