$ man timex
User Commands                                            timex(1)

NAME
     timex - time a  command;  report  process  data  and  system
     activity

SYNOPSIS
     timex [-o] [-p [-fhkmrt]] [-s] command

DESCRIPTION
     The given command is executed; the elapsed time,  user  time
     and  system time spent in execution are reported in seconds.
     Optionally, process accounting data for the command and  all
     its  children  can be listed or summarized, and total system
     activity during the execution interval can be reported.

     The output of timex is written on standard error.