update cat.md
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@ -21,7 +21,7 @@ cat(选项)(参数)
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- -s或--squeeze-blank:当遇到有连续两行以上的空白行,就代换为一行的空白行;
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- -A:显示不可打印字符,行尾显示“$”;
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- -e:等价于"-vE"选项;
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- -t:`等价`于"-vT"选项;
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- -t:等价于"-vT"选项;
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## 例子
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