如果给定了count, vmstat就会重复获取系统的统计数据，直到达到了所指定的count次数。
If a count is given, vmstat will pull system statistics repeatedly until it reaches the number of count times specified.
指定了重复计数。该值为用户按住键时产生的重复击键次数。
Specifies the repeat count. The value is the number of times the keystroke is repeated as a result of the user holding down the key.
您可以指定此计数器的起始值和终止值，并可以选择指定计数器从一个重复到下一个重复递增的数量。
You specify the starting and ending values for this counter, and you can optionally specify the amount by which it increases from one repetition to the next.
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