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概述

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# top -h 
top: illegal option -- h
top - display system usage (UNIX)

top  top [-i <number>] [-d] [-n <node>]
Options:
 -d         dumb terminal  
 -b         batch mode for background operation
 -n <node>  remote node
 -p <pri>   run at priority
 -i <iter>  # of iterations
 -z <num>   number of threads to display   #显示线程的数量 
 -D <delay> delay in seconds   # 显示的更新速度
 -t         display thread names   #显示线程名称。-D 1 一秒钟显示一次

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