通过其他程序或脚本在非交互式模式下调用top命令，经常会出现:
top: failed tty get 错误
解决办法：加个-b 选项皆可
-b : Batch mode operation
Starts top in Batch mode, which could be useful for sending output from top to other programs or to a file. In this mode, top will not accept input and runs until the iterations limit youve set with the -n command-line option or until killed.
例如执行：top -bn 1
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