Other options allow for:

Default output :

• real - actual time taken.
• user - amount of time in user's environment.
• sys - amount of system time, doing thing like I/O

bash has built-in version that takes no options.
Run whereis time to find path to external command.
To run the standard time command, use the full path.

# Contents of timed file Command being timed: "ps -ef" User time (seconds): 0.00 System time (seconds): 0.00 Percent of CPU this job got: 85% Elapsed (wall clock) time (h:mm:ss or m:ss): 0:00.01 Average shared text size (kbytes): 0 Average unshared data size (kbytes): 0 Average stack size (kbytes): 0 Average total size (kbytes): 0 Maximum resident set size (kbytes): 2556 Average resident set size (kbytes): 0 Major (requiring I/O) page faults: 0 Minor (reclaiming a frame) page faults: 152 Voluntary context switches: 1 Involuntary context switches: 240 Swaps: 0 File system inputs: 0 File system outputs: 0 Socket messages sent: 0 Socket messages received: 0 Signals delivered: 0 Page size (bytes): 4096 Exit status: 0

Options for program version :
-o filename # save time information to file.
-a filename # append output to file, needs to be used with -o.
-f # format output in certain way. See man page.
-v # very detailed list of resources used and how much.
--quiet # don't normally preserve status of run command.
# Given the speed of current CPUs, time generally only useful when observing large tasks, such as compiling 1000's of lines of code.

-s # set date. User has to have admin status to run.
-r file # displays last modified time of named file.
-u # show date in Universal Time.
"+%..." # format date output, needs to be quoted. Extensive, see man page.
• date "+%Y%j%H" print date as 4 digit year, day of year, hour of day (24hr), no spaces.