统计下命令执行了多长时间。neutron，date，time

admin

date >> /tmp/date.log;neutron security-group-rule-list --security-group-id 369c4827-fa40-4618-884d-88b985b82ac7 --debug;date >>/tmp/date.log;for i in {1..10} ;do echo -e "\a";sleep 0.5;done

3 a5 E0 I/ b; Wless date.log
6 y. ?0 O, d  c4 Y0 c7 V9 D" CFri Jan 25 14:40:42 CST 2019
+ G' V8 M) P' y* ~Fri Jan 25 14:47:15 CST 2019

/ C( b2 E% ^' M: }% W% i
time neutron security-group-rule-list --security-group-id 369c4827-fa40-4618-884d-88b985b82ac7 --debug

/ m8 v# }+ `. |. ]" y  }
real        6m48.660s
7 c1 l# ]5 k+ K% L/ I! f: P* c+ ^user        0m5.549s
sys        0m1.922s

admin

time shell code
real        6m48.660s
+ d; J. e. Q  N! f user        0m5.549s
sys        0m1.922s