Installing Icarus/iverilog(free verilog simulator) in Ubuntu

Icarus Verilog is a free and opensource Verilog simulation and synthesis tool. It compiles the verilog source file to some target format known as vvp.

This intermediate format is simulated with vvp command. For synthesis netlists can be generated.

Icarus verilog is now available in Ubuntu respository and can be installed with apt command

$ sudo apt-get install iverilog