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+The following is a demonstration of the fddist command,
+
+
+Here fddist is run for a few seconds on an idle workstation,
+
+ Tracing reads and writes... Hit Ctrl-C to end.
+ ^C
+ EXEC: dtrace PID: 3288
+
+ value ------------- Distribution ------------- count
+ 0 | 0
+ 1 |@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ 2
+ 2 | 0
+
+ EXEC: mozilla-bin PID: 1659
+
+ value ------------- Distribution ------------- count
+ 3 | 0
+ 4 |@@@@@@@@@@ 28
+ 5 | 0
+ 6 |@@@@@@@@@@@@@@@ 40
+ 7 |@@@@@@@@@@@@@@@ 40
+ 8 | 0
+
+ EXEC: Xorg PID: 1532
+
+ value ------------- Distribution ------------- count
+ 22 | 0
+ 23 |@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ 57
+ 24 | 0
+
+The above displays the usage pattern for process file descriptors.
+We can see the Xorg process (PID 1532) has made 57 reads or writes to
+it's file descriptor 23.
+
+The pfiles(1) command can be used to help determine what file
+descriptor 23 actually is.
+
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