为什么“man x-terminal-emulator”返回“man gnome-terminal”的输出？

Question

我知道是什么x-terminal-emulator和做什么，但我不明白为什么不存在一个特殊的手册页，而是将其重定向到gnome-terminal. 我想看一个手册页，解释x-terminal-emulator究竟做了什么，并在该页中引用了man gnome-terminal.

这是正确的（如果是，那么为什么，例如，输出man dir不返回输出man ls）？这个事实背后有什么好的动机吗？

Answer 1

x-terminal-emulator是一个虚拟 包。终端模拟器由 Debian 的替代系统配置。

在 Ubuntu 上，您可以轻松地遵循此符号链接构造，例如对于 gnome-terminal：

$ which x-terminal-emulator
/usr/bin/x-terminal-emulator
$ ls -lF /usr/bin/x-terminal-emulator
/usr/bin/x-terminal-emulator -> /etc/alternatives/x-terminal-emulator*
$ ls -al /etc/alternatives/x-terminal-emulator
/etc/alternatives/x-terminal-emulator -> /usr/bin/gnome-terminal.wrapper*

现在关于手册页，update-alternatives还gnome-terminal可以x-terminal-emulator按照update-alternatives手册中的说明链接to的手册页：

   It is often useful for a number of alternatives to be synchronized,  so
   that they are changed as a group; for example, when several versions of
   the  vi(1)  editor  are  installed,  the   man   page   referenced   by
   /usr/share/man/man1/vi.1 should correspond to the executable referenced
   by /usr/bin/vi.  update-alternatives handles this by  means  of  master
   and  slave links; when the master is changed, any associated slaves are
   changed too.  A master link and its associated slaves make  up  a  link
   group.

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