time : コマンドの実行時間を計測する

Icarus verilogでのシミュレーション実行時間を計測
$ time vvp hoge
VCD info: dumpfile test.vcd opened for output.
*** Write Transaction Start ***
*** Write Transaction End ***
*** Read Transaction Start ***
*** Read Transaction End ***
*** Write Transaction Start ***
Timeout Error
Simulation Stopped!

real    0m0.016s
user    0m0.010s
sys     0m0.000s