I read the man pages and the '-v' option(short for --verbose) is there and I'm sure this should work:  time -v ls However, the output is: -v: Command not found.0.000u 0.000s 0:00.00 0.0%      0+0k 0+0io 0pf+0wI typed the command according to the man pages in the order of 'time argument(s) command'. I can't see where I made a mistake here.
How can I use '-v' option in time command?
bash;time
In bash:$ type -a timetime is a shell keywordtime is /usr/bin/timeYou called time, cause bash invoked time built in keyword instead of external /usr/bin/time command. time built in keyword does not have option -v. bash interpreted that you calling built in time on command -v, causing this error.Try:/usr/bin/time -v lsor:command time -v ls