... 结尾空白符 trailing blanks; trailing spaces 空白符号 blank character; clear character; null 伪空白符 pseudo-blank symbol ...
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So for fixed record formats, you'll get the entire record, including trailing blanks.
因此，对于固定记录格式，会获得整个记录，包括末尾的空白。
You can remove trailing blanks from a file by using the s command and substituting a null replacement.
通过使用s命令并替换一个空替换字符，您可以删除尾随空格。
The rest of the expression is used to see if the value (without leading or trailing blanks) is an empty string.
表达式的其余部分用来检查值(去掉头尾的空格之后)是否是空字符串。
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