verilog

[kisiako]

Hello, I have a question I am trying to compile verilog code. I saved the file with a .v extension and to compile it i do:
iverilog -t vvp filename.v -o out_filename (this works)
however i am trying to view the results by typing in
vpp out filename and that says that vpp command not found. does anyone know how i could view the results?