Note that -f is the input field separator defined by the predefined variable FS.
注意- F是由预先定义的FS变量所定义的输入域分隔符。
Unless you specify a different field separator, fields are delimited by blanks or tabs.
除非您指定了一个不同的字段分隔符，否则将使用空格或制表符分隔字段。
The difference between these two methods has to do with how we set the field separator.
两种方法的区别在于如何设置字段分隔符。
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