time - provide a simple elapsed time value
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   time [-h][-u]

   Prints the processor time used since the last time command, and the total
   processor time used since VIS was started.

   By default, the time reported is the CPU time spent executing instructions
   of the calling process and the time this process waited for children that
   terminated.

   Command options:

   -h
          Print the command usage.

   -u
          Exclude child process time.
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   Last updated on 20100410 00h02