escaping - 在 groff 中转义点

Question

根据info groff（第 5.11 节字符翻译）， \.应该只打印点。然而，这似乎不是发生的事情。如果我呈现这个手册页

.TH x x x x
\.SH foo

我被foo渲染为章节标题，并且.SH没有被打印出来。

那么，为什么会发生这种情况，以及如何在 groff 行的开头避开点（和撇号）？

Answer 1

要在行首转义点，请使用\[char46]：

\[char46]SH foo

印刷

.SH foo

这是预期的行为，但应在手册页中修复。这是一个错误报告。

您可以在下面阅读\\（缩短的）和\. （来自信息页面）的描述。

-- Escape: \\
[...]

`\\' is a `delayed' backslash; more precisely, it is the default
escape character followed by a backslash, which no longer has
special meaning due to the leading escape character. It is _not_
an escape sequence in the usual sense! In any unknown escape
sequence `\X' the escape character is ignored and X is printed.
But if X is equal to the current escape character, no warning is
emitted.

As a consequence, only at top-level or in a diversion a backslash
glyph is printed; in copy-in mode, it expands to a single
backslash which then combines with the following character to an
escape sequence.

[...]

-- Escape: \.
Similar to `\\', the sequence `\.' isn't a real escape sequence.
As before, a warning message is suppressed if the escape character
is followed by a dot, and the dot itself is printed.

Answer 2

只需在点前面加上一个宽度为零的字符：

\&. -- this a a dot.

或暂时切换到另一个控制字符：

.cc #
. -- this is a dot.
#cc