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Old 10-12-2005, 11:04 PM   #1
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Question what is the command 'time'?

hi, everybody!
When I type the 'time' command, it will appear :
real 0m0.084s
user 0m0.000s
sys 0m0.000s
I want to know the meaning of 'time, user, and sys' in the above lines.
please, help me!
Old 10-12-2005, 11:15 PM   #2
Wim Sturkenboom
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Does man time and man 2 times not give you the answer?
Old 10-12-2005, 11:15 PM   #3
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From man time:
The default format string is
%Uuser %Ssystem %Eelapsed %PCPU (%Xtext+%Ddata %Mmax)k
%Iinputs+%Ooutputs (%Fmajor+%Rminor)pagefaults %Wswaps


%E Elapsed real time (in [hours:]minutes:seconds).

%e (Not in tcsh.) Elapsed real time (in seconds).

%S Total number of CPU-seconds that the process spent in kernel

%U Total number of CPU-seconds that the process spent in user mode.

%P Percentage of the CPU
so real is the time that elapsed while the process was running
user is how much CPU-time it spent in user mode
sys is how much CPU-time it spent in kernel mode
Old 10-13-2005, 01:46 PM   #4
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plz use -help option


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