The following is a demonstration of the iofileb.d script,
 
 
 Here we run it while a tar command is backing up /var/adm,
 
    # ./iofileb.d
    Tracing... Hit Ctrl-C to end.
    ^C
       PID CMD              KB FILE
     29529 tar              56 /var/adm/sa/sa31
     29529 tar              56 /var/adm/sa/sa03
     29529 tar              56 /var/adm/sa/sa02
     29529 tar              56 /var/adm/sa/sa01
     29529 tar              56 /var/adm/sa/sa04
     29529 tar              56 /var/adm/sa/sa27
     29529 tar              56 /var/adm/sa/sa28
     29529 tar             324 /var/adm/exacct/task
     29529 tar             736 /var/adm/wtmpx
 
 In the above output, we can see that the tar command has caused 736 Kbytes
 of the /var/adm/wtmpx file to be read from disk. All af the Kbyte values
 measured are for disk activity.