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Top Forums Shell Programming and Scripting Storing output of "time" command to a variable Post 302490033 by methyl on Sunday 23rd of January 2011 02:49:01 PM
Old 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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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)
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