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Full Discussion: Time Diff in shell script
Top Forums Shell Programming and Scripting Time Diff in shell script Post 302448344 by agama on Wednesday 25th of August 2010 10:09:18 PM
Old 08-25-2010
Unless you have a non-Posix flavour of date you'll have the dickens of a time trying to work magic with date arithmetic. If all you want is the wall clock time (real time) that a process (script, or programme) took to run then try this:

Code:
#!/usr/bin/env ksh 
#ksh is cleaner because ksh gets it right when reading from a pipe into variables
(time -p sleep 5) 2>&1 | read junk real; 
echo $real

Code:
#!/usr/bin/env bash
# if you have to, messier because bash buggers reading from pipes
real=$( (time -p sleep 5) 2>&1 )
real=${real#real }
echo ${real%%user*}

What I have done in the past is to write a simple C programme that prints the current time as an integer and use that to capture the time before and after a series of commands. Not all that accurate, but if your commands are running for a few minutes then the time to load and execute the little programme twice can be neglected. It was also quicker to do that than to dork round with date and time when AT&T AST or GNU tools aren't available.

Code:
start=$( itime )         # integer time in seconds
# command(s)
end=$( itime )

echo "duration: $(( $end - $start ))s"

 

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LEARN ABOUT SUSE

artswrapper

artswrapper(7)							       Arts							    artswrapper(7)

NAME

       artswrapper - used to set real-time priority to artsd, the KDE sound system

SYNOPSIS

       artswrapper [OPTION]

DESCRIPTION

       artswrapper gives artsd the capability of running with real-time scheduling priority. This helps prevent audio skips and jumps.

       Except  for  the  check option, artswrapper passes all other arguments directly to artsd. Artswrapper calls the arguments after setting the
       real-time priority and dropping privileges (if running as setuid root).

       The real-time status is passed to artsd via the environment variable STARTED_THROUGH_ARTSWRAPPER, and can be one of the	following  values:
       unset  (not  running as real-time), 1 (running as real-time), 2 (no privileges to set real-time scheduling), or 3 (no support for real-time
       scheduling).

OPTIONS

       check backward compatibility with old artswrapper.  This only prints "okay" and exits.

SECURITY

       artswrapper must be used as setuid root to have privileges to set real-time scheduling.

BUGS

       Sometimes artsd locks the system on exit in 2.4 kernels.  If this happens, use aKode library, which improves the CPU usage, helps  maintain
       uninterrupted sound, and remove the setuid bit from artswrapper (thanks to Debian documentation and Christopher Martin).

SEE ALSO

       artsd, artsdsp

AUTHOR

       Manpage written by Rodrigo Rubira Branco <rrbranco@br.ibm.com>

KDE Multimedia							   Jun 01, 2006 						    artswrapper(7)
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