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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 OPENSOLARIS

time

time(1T)						       Tcl Built-In Commands							  time(1T)

__________________________________________________________________________________________________________________________________________________

NAME

       time - Time the execution of a script

SYNOPSIS

       time script ?count?
_________________________________________________________________

DESCRIPTION

       This command will call the Tcl interpreter count times to evaluate script (or once if count isn't specified).  It will then return a string
       of the form
	      503 microseconds per iteration
       which indicates the average amount of time required per iteration, in microseconds.  Time is measured in elapsed time, not CPU time.

EXAMPLE

       Estimate how long it takes for a simple Tcl for loop to count to a thousand:
	      time {
		  for {set i 0} {$i<1000} {incr i} {
		      # empty body
		  }
	      }

SEE ALSO

       clock(1T)

KEYWORDS

       script, time

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +--------------------+-----------------+
       |  ATTRIBUTE TYPE    | ATTRIBUTE VALUE |
       +--------------------+-----------------+
       |Availability	    | SUNWTcl	      |
       +--------------------+-----------------+
       |Interface Stability | Uncommitted     |
       +--------------------+-----------------+
NOTES

       Source for Tcl is available on http://opensolaris.org.

Tcl																	  time(1T)
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