Linux 行尾（新行）在 bash 中转义
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End of line (new line) escapes in bash
提问by Yoland
Escape character (\) can be used to escape end of line, e.g.
转义字符 ( \) 可用于转义行尾，例如
% echo This could be \
a very \
long line\!
This could be a very long line!
%
however, isn't end of line (new line) represented by \nwhich has two characters. shouldn't the result of the escape be the literal of \n. e.g.
但是，不是由\nwhich表示的行尾（新行）有两个字符。转义的结果不应该是\n. 例如
%echo $'\n'
\n
%
Thank you for your answer!
谢谢您的回答！
Edit:
Sorry, I didn't explain it well enough. I am not trying to echo a new line. I am wondering why \is able to new line character (\n) which has two character instead of just escape the backslash in the new line character and produce the literal of \n
编辑：对不起，我没有很好地解释它。我不是要回应一个新行。我想知道为什么\能够换行符 ( \n) 有两个字符，而不是仅仅转义换行符中的反斜杠并产生 \n 的文字
采纳答案by Markku K.
Actually, \nis not reallya newline character -- it is an escape sequence that representsa newline (which is just one character in Linux). The \at the end of a line escapes the actualnewline character that you type in using the enter key. You can look at what ASCII values represent different characters using hexdump:
实际上，\n它并不是真正的换行符——它是一个表示换行符的转义序列（在 Linux 中只是一个字符）。在\一行的末尾逃脱实际您在使用回车键输入换行符。您可以使用hexdump查看哪些 ASCII 值代表不同的字符：
%echo $'\n'
\n
%echo $'\n' | hexdump -C
00000000 5c 6e 0a |\n.|
00000003
You will notice that echo printed out 3 characters: \(5c), n(6e), and a newline (0a). You will also notice that on the right hand side of the hexdump output, newline shows up as a ".", because it is considered a non-printing character.
您会注意到 echo 打印出 3 个字符：\(5c)、n(6e) 和一个换行符 (0a)。您还会注意到，在 hexdump 输出的右侧，换行符显示为“.”，因为它被视为非打印字符。
回答by Nicola Musatti
Newline is the name given in the UNIX world to a character that ends a line in a line-oriented file (or in a terminal). In the UNIX/Linux world this corresponds to the ASCII linefeed character.
换行符是 UNIX 世界中给在面向行的文件（或终端）中结束一行的字符的名称。在 UNIX/Linux 世界中，这对应于 ASCII 换行符。
Different systems use different conventions to end lines: Windows uses a sequence of carriage return and line feed, while Mac originally used a single carriage return. This confusion stems from the fact that these were originally commands needed to move a printer's print head to the beginning of a new line.
不同的系统使用不同的约定来结束行：Windows 使用回车和换行的序列，而 Mac 最初使用单个回车。这种混淆源于这样一个事实，即这些最初是将打印机的打印头移动到新行开头所需的命令。
\nis a conventional way of expressing the end of line character in code, again originally in the UNIX world, more precisely in the C language. Note that when reading a text file C reads a single newline character even on systems where this is really a two character sequence.
\n是在代码中表示行尾字符的一种传统方式，同样最初是在 UNIX 世界中，更准确地说是在 C 语言中。请注意，即使在实际上是两个字符序列的系统上，读取文本文件时 C 也会读取单个换行符。
