On Fri, 10 Dec 2010, Warren Block wrote:
Description:
iostat(8) says:
-c Repeat the display count times. If no repeat count is specified,
the default is infinity.
This used to be correct. It said "if no wait interval is specified, then
the default [for the wait interval] is 1 second". This was a bit confusing
since it didn't say that the default is for the wait interval. Now it is
just broken, since it is the -c option and not its repeat count that is
optional.
But if you try to run it without a repeat count:
% iostat -c
iostat: option requires an argument -- c
usage: iostat [-CdhIKoTxz?] [-c count] [-M core] [-n devs] [-N system]
[-t type,if,pass] [-w wait] [drives]
The synopsis and usage message correctly specify that -c must have an arg.
The -w option has the complement of this breakage.
Either -w wait or the the normal way using the undocumented alias for this
("iostat wait", where `wait is a number') must be used to specifiy the wait
time for -c. Not documenting this may be intentional, but it became
especially broken when the `drives' option was added, since according to
the synopsis and usage message "iostat 1" says to give statistics for the
drive named "1", but it is actually an alias for "iostat -w 1".
Bruce
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