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The rusage command is similar to time(1) . It runs the given command, which must be specified; that is, command is not optional as it is in the C shell’s timing facility. When the command is complete, rusage displays the real (wall clock), the system CPU , and the user CPU times which elapsed during execution of the command, plus other fields in the rusage structure, all on one long line. Times are reported in seconds and hundredths of a second.
The example below shows the format of rusage output.
example% rusage wc /usr/share/man/man1/csh (1) 3045 13423 78071 /usr/share/man/man1/csh (1) 2.26 real 0.80 user 0.36 sys 11 pf 38 pr 0 sw 11 rb 0 wb 16 vcx 37 icx 24 mx 0 ix 1230 id 9 is example%
Each of the fields identified corresponds to an element of the rusage structure, as described in getrusage(3C) , as follows:
real elapsed real time user ru_utime user time used sys ru_stime system time used pf ru_majflt page faults requiring physical I/O pr ru_minflt page faults not requiring physical I/O sw ru_nswap swaps rb ru_inblock block input operations wb ru_oublock block output operations vcx ru_nvcsw voluntary context switches icx ru_nivcsw involuntary context switches mx ru_maxrss maximum resident set size ix ru_ixrss currently 0 id ru_idrss integral resident set size is ru_isrss currently 0
When the command being timed is interrupted, the timing values displayed may be inaccurate.