As it points out in that answer on the HP forums, calling an external command (even on your Linux system) will distort the answer.
What are you trying to achieve with this? If it's how long a program takes to run, look at the "time" or "timex" commands, that will execute the actual program and report useful info back.
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by: liddlerPosted on 2009-08-28 at 00:35:02ID: 25205582
looks like you can't do it from the shell and would have to do it wit hperl or C: m/service/ forums/que stionanswe r.do? admit =109447626 +125144477 1927+28353 475&thread Id=1018193
http://forums11.itrc.hp.co