Unix: confusing use of the Tee -command

Question

Manual states that the tee is a \"pipe fitting\"-tool. The cases [1] confuse me:

1. case

echo \"foo bar\" | sudo tee -a /path/to/some/fi         


        

Answer 1

tee command simply creates N+1 no of files , 1 copy passed to stdout and others to the arguments provided to tee (ie files ) where N: number of agruments passed to tee