01-23-2011
It's hard to improve on the explanation in "man time".
If you just want to know how long a process took to run, use "real time".
If you want to know how much CPU time the process used while in "user mode" use "user".
If you want to know how much CPU time the process used while in "kernel mode", use "sys".
One facinating aspect of unix is that the statistics from the "time" command may not be the same for the second and subsequent invocations of the same command. A well-tuned system will cache data blocks, directory blocks and program pages as it continuously re-tunes itself.
The difference is most evident after a cold start of the Operating System.
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LEARN ABOUT OPENSOLARIS
times
times(1) User Commands times(1)
NAME
times - shell built-in function to report time usages of the current shell
SYNOPSIS
sh
times
ksh
times
DESCRIPTION
sh
Print the accumulated user and system times for processes run from the shell.
ksh
Print the accumulated user and system times for the shell and for processes run from the shell.
On this man page, ksh(1) commands that are preceded by one or two * (asterisks) are treated specially in the following ways:
1. Variable assignment lists preceding the command remain in effect when the command completes.
2. I/O redirections are processed after variable assignments.
3. Errors cause a script that contains them to abort.
4. Words, following a command preceded by ** that are in the format of a variable assignment, are expanded with the same rules as a
variable assignment. This means that tilde substitution is performed after the = sign and word splitting and file name genera-
tion are not performed.
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
+-----------------------------+-----------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+-----------------------------+-----------------------------+
|Availability |SUNWcsu |
+-----------------------------+-----------------------------+
SEE ALSO
ksh(1), sh(1), time(1), attributes(5)
SunOS 5.11 15 Apr 1994 times(1)