4 examples for yes

  # Repeatedly outputs "kitty"
yes kitty
        

  # Repeatedly outputs "y"
yes
        

  # Copy a line 50 times into a file
yes "Are you a bro?" | head -n 50 > questioning_bro.txt
        

  # Output "bro" repeatedly until terminated
yes bro

# Output "y" (default behaviour of no arguments are passed)
yes