bash 期望中的 \n 和 \r 之间的区别？
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Difference between \n and \r in expect?
提问by Jasmine Lognnes
In this particular script they use \n.
在这个特定的脚本中，他们使用\n.
#!/usr/bin/expect
set password [lindex $argv 0]
spawn asadmin enable-secure-admin
expect "admin"
send "admin\n"
expect "password"
send "$password\n"
expect eof
exit
Question
题
Could \rjust as well have been used? If not, what are the differences?
也能用\r吗？如果不是，有什么区别？
回答by Kenster
\nis linefeed, Ctrl-J or character 012. \ris carriage return, Ctrl-M or character 015.
\n是换行、Ctrl-J 或字符 012。\r是回车、Ctrl-M 或字符 015。
In an interactive unix context, when you're typing them (or simulating typing them, as with expect), they are interchangeable. Linefeed is the formal line-terminator character, but tty devices normally translate carriage return to linefeed on input. On your keyboard, the BKWA (big key with arrow which might be labelled "enter" or "return"), sends a Ctrl-M, which the tty device will translate to Ctrl-J. If your BKWA is broken, you can actually type Ctrl-M or Ctrl-J and it'll work just as well.
在交互式 unix 上下文中，当您键入它们（或模拟键入它们，如预期）时，它们是可以互换的。换行符是正式的换行符，但 tty 设备通常在输入时将回车符转换为换行符。在您的键盘上，BKWA（带箭头的大键，可能标记为“输入”或“返回”）发送一个 Ctrl-M，tty 设备会将其转换为 Ctrl-J。如果您的 BKWA 坏了，您实际上可以键入 Ctrl-M 或 Ctrl-J，它也能正常工作。
On output they're not interchangeable. As I said, linefeed is the formal line terminator character, so programs (and text files) will indicate end-of-line with a linefeed. When a linefeed is output to a tty, the tty will normally translate it into a carriage-return-linefeed pair.
在输出上，它们不可互换。正如我所说，换行符是正式的行终止符，因此程序（和文本文件）将用换行符指示行尾。当换行符输出到 tty 时，tty 通常会将其转换为回车换行符对。
When the characters actually reach the display device, carriage return moves the cursor to the beginning of the row, while linefeed moves it down a row.
当字符真正到达显示设备时，回车将光标移动到行的开头，而换行将其向下移动一行。
