什么$'\ n'在bash中意味着什么？

Question

此stackoverflow问题In a Linux shell how can I process each line of a multiline string?中的答案提到$'\n'是一种特殊语法“并非在每个shell中都可用。”

我想知道语法是什么意思？

谢谢。

Answer 1

请参阅QUOTING手册页的bash部分：

   Words of the form $'string' are treated specially.  The word  expands  to
   string,  with  backslash-escaped  characters replaced as specified by the
   ANSI C standard.  Backslash escape sequences, if present, are decoded  as
   follows:

...
              \n     new line
...

   The  expanded result is single-quoted, as if the dollar sign had not been
   present.

此语法不是标准Unix Bourne shell的一部分。它可能是特定的bash，虽然我没有环顾四周看看其他shell是否支持它。