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转义是一种引用单字符的方法。通过在特殊字符前加上转义符 \ 来告诉shell按照字面意思去解释这个字符。 需要注意的是,在一些特定的命令和工具,比如 echo 和 sed 中,转义字符通常会起到相反的效果,即可能会使得那些字符产生特殊含义。 换行(line feed)。
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