第二种机制在命令行参数输出的指令控制下，把自己标准输入中的行写入日志文件。
It writes lines from its standard input to log files under the control of instructions you enter as command-line arguments.
标准的输入也能来自指令的左边。
Standard input can come from the left side of a command as well.
标准的输入也能来自指令的左边。
Standard input can come from the left side of a command as well.
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