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“向后删除行”和“unix 行丢弃”之间的区别

tag-icon • tag-icon command-line emacs readline
“向后删除行”和“unix 行丢弃”之间的区别

我正在阅读 bash 手册页并记住键盘快捷键。C-x rubout绑定到backward kill line，并且C-u绑定到unix line discard，但这些命令的描述看起来相同。 这些命令之间有什么区别？

答案1

在他们的当前实施，这两个函数看起来或多或少做了相同的事情，除了backward-kill-line可以接受负前缀参数，而unix-line-discard忽略前缀参数。

/* Here is C-u doing what Unix does.  You don't *have* to use these
   key-bindings.  We have a choice of killing the entire line, or
   killing from where we are to the start of the line.  We choose the
   latter, because if you are a Unix weenie, then you haven't backspaced
   into the line at all, and if you aren't, then you know what you are
   doing. */
int
rl_unix_line_discard (int count, int key)
{
  if (rl_point == 0)
    rl_ding ();
  else
    {
      rl_kill_text (rl_point, 0);
      rl_point = 0;
      if (rl_editing_mode == emacs_mode)
    rl_mark = rl_point;
    }
  return 0;
}

/* Kill backwards to the start of the line.  If DIRECTION is negative, kill
   forwards to the line end instead. */
int
rl_backward_kill_line (int direction, int key)
{
  int orig_point;

  if (direction < 0)
    return (rl_kill_line (1, key));
  else
    {
      if (rl_point == 0)
    rl_ding ();
      else
    {
      orig_point = rl_point;
      rl_beg_of_line (1, key);
      if (rl_point != orig_point)
        rl_kill_text (orig_point, rl_point);
      if (rl_editing_mode == emacs_mode)
        rl_mark = rl_point;
    }
    }
  return 0;
}

答案2

以下是我发现的内容：

backward-kill-line (C-x Rubout)
    Kill backward to the beginning of the line.

unix-line-discard (C-u)
    Kill backward from the cursor to the beginning of the current line.

https://ftp.gnu.org/old-gnu/Manuals/bash-2.05a/html_node/bashref_97.html

       backward-kill-line (C-x Rubout)
              Kill backward to the beginning of the line.
       unix-line-discard (C-u)
              Kill backward from point to the beginning of the line.  The
              killed text is saved on the kill-ring.

https://man7.org/linux/man-pages/man3/readline.3.html#EDITING_COMMANDS

似乎可以unix-line-discard将其保存在钥匙圈上，但backward-kill-line不能 - 但是我不知道如何验证这一点，以及Emacs 维基说backward-kill-line也附加到 jeyring

这些术语的其他用法：https://github.com/junegunn/fzf/pull/489/files#diff-1fabf11f4aca2d62eb64290f66d25217R180

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