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time


NAME
     time - time a simple command

SYNOPSIS
     time [-p] utility [argument...]

DESCRIPTION
     The time utility invokes utility operand with argument,  and
     writes a message to standard error that lists timing statis-
     tics for utility. The message includes the following  infor-
     mation:

       o  The elapsed (real) time between invocation  of  utility
          and its termination.

       o  The User  CPU  time,  equivalent  to  the  sum  of  the
          tms_utime   and   tms_cutime  fields  returned  by  the
          times(2) function for the process in which  utility  is
          executed.

       o  The System CPU time,  equivalent  to  the  sum  of  the
          tms_stime and tms_cstime fields returned by the times()
          function for the process in which utility is executed.


     When time is used as part of a pipeline, the times  reported
     are unspecified, except when it is the sole command within a
     grouping command in that pipeline. For example, the commands
     on  the  left  are unspecified; those on the right report on
     utilities a and c, respectively:

     time a | b | c      { time a } | b | c
     a | b | time c      a | b | (time c)


OPTIONS
     The following option is supported:

     -p       Writes the timing output to standard error  in  the
              following format:


              real %f\nuser %f\nsys %f\n < real seconds>, <user seconds>,
              <system seconds>



OPERANDS
     The following operands are supported:

     utility         The name  of  the  utility  that  is  to  be
                     invoked.

     argument        Any string to be  supplied  as  an  argument
                     when invoking utility.



USAGE
     The time utility returns exit status 127 if an error  occurs
     so  that  applications  can  distinguish  "failure to find a
     utility" from "invoked utility exited with an error  indica-
     tion."  The  value 127 was chosen because it is not commonly
     used for other meanings. Most utilities use small values for
     "normal  error  conditions"  and the values above 128 can be
     confused with termination due to receipt of  a  signal.  The
     value  126  was  chosen in a similar manner to indicate that
     the utility could be found, but not invoked.

EXAMPLES
     Example 1: Using the time command

     It is frequently desirable to apply  time  to  pipelines  or
     lists of commands. This can be done by placing pipelines and
     command lists in a single file. This single file can then be
     invoked  as a utility, and the time applies to everything in
     the file.

     Alternatively, the following command can be  used  to  apply
     time to a complex command:

     example% time sh -c 'complex-command-line'

     Example 2: Using time in the csh shell

     The following two examples show the differences between  the
     csh  version of time and the version in /usr/bin/time. These
     examples assume that csh is the shell in use.

     example% time find / -name csh.1 -print
     /usr/share/man/man1/csh.1
     95.0u 692.0s 1:17:52 16% 0+0k 0+0io 0pf+0w

     See csh(1) for an explanation of the format of time output.

     example% /usr/bin/time find / -name csh.1 -print
     /usr/share/man/man1/csh.1
     real  1:23:31.5
     user     1:33.2
     sys     11:28.2

ENVIRONMENT VARIABLES
     See environ(5) for descriptions of the following environment
     variables  that  affect the execution of time: LANG, LC_ALL,
     LC_CTYPE, LC_MESSAGES, LC_NUMERIC,  NLSPATH, and PATH.

EXIT STATUS
     If utility is invoked, the exit status of time will  be  the
     exit  status  of  utility.  Otherwise, the time utility will
     exit with one of the following values:

     1-125           An error occurred in the time utility.



     126             utility was found but could not be invoked.



     127             utility could not be found.



ATTRIBUTES
     See attributes(5) for descriptions of the  following  attri-
     butes:

     ____________________________________________________________
    |       ATTRIBUTE TYPE        |       ATTRIBUTE VALUE       |
    |_____________________________|_____________________________|
    | Availability                | SUNWcsu                     |
    |_____________________________|_____________________________|
    | Interface Stability         | Standard                    |
    |_____________________________|_____________________________|


SEE ALSO
     csh(1),  shell_builtins(1),   timex(1),   times(2),   attri-
     butes(5), environ( 5), standards(5)

NOTES
     When the time command is run on  a  multiprocessor  machine,
     the  total of the values printed for user and sys can exceed
     real. This is  because on a  multiprocessor  machine  it  is
     possible to divide the task between the various processors.

     When the command being  timed  is  interrupted,  the  timing
     values displayed may not always be accurate.

BUGS
     Elapsed time is accurate to the second, while the CPU  times
     are  measured  to  the 100th second. Thus the sum of the CPU
     times can be up to a second larger than the elapsed time.






Man pages from Solaris 10 Update 8. See docs.sun.com and www.oracle.com for further documentation and Solaris information.
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