;      /* block output operations */
    int  ru_msgsnd;       /* messages sent */
    int  ru_msgrcv;       /* messages received */
    int  ru_nsignals;     /* signals received */
    int  ru_nvcsw;        /* voluntary context switches */
    int  ru_nivcsw;       /* involuntary context switches */
</PRE>

<P>

<A NAME="22212"></A>
<B>unix:system</B> <EM>[command] </EM>[function]

<DL COMPACT>
<DT> 
<DD> 
executes <EM>command</EM> in a sub shell.
<EM>command</EM> must be recognizable by Bourn-shell.
</DD>