:$ time sleep 1 real 0m1.004s user 0m0.002s sys 0m0.001s $ type time time is a shell keyword $ which time /usr/bin/time $ /usr/bin/time gcc test.c -o test 0.03user 0.01system 0:00.05elapsed 98%CPU (0avgtext+0avgdata 20564maxresident)k 0inputs+40outputs (0major+4475minor)pagefaults 0swaps