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Unix Version 7 - man page for time (v7 section 1)

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TIME(1) 										  TIME(1)

       time - time a command

       time command

       The  given  command is executed; after it is complete, time prints the elapsed time during
       the command, the time spent in the system, and the time spent in execution of the command.
       Times are reported in seconds.

       The  execution  time can depend on what kind of memory the program happens to land in; the
       user time in MOS is often half what it is in core.

       The times are printed on the diagnostic output stream.

       Elapsed time is accurate to the second, while the CPU times are measured to the 60th  sec-
       ond.  Thus the sum of the CPU times can be up to a second larger than the elapsed time.

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