我正在学习 LaTeX短. 第 12 页，表 1.3：与 LaTeX 一起分发的一些软件包，包含以下内容。
doc 允许 LA TEX 程序的文档。
在 doc.dtx a和 LA TEX Companion 中描述
doc.dtx 的脚注如下：
a此文件应安装在您的系统上，并且您应该能够通过在具有写入权限的任何目录中键入 latex doc.dtx 来获取 dvi 文件。此表中提到的所有其他文件也是如此。
我在 Debian 8.3 上使用 texlive。
当我运行该latex doc.dtx命令时，出现以下错误。
$ latex doc.dtx
This is pdfTeX, Version 3.14159265-2.6-1.40.15 (TeX Live 2015/dev/Debian) (preloaded format=latex)
restricted \write18 enabled.
entering extended mode
! I can't find file `doc.dtx'.
<*> doc.dtx
(Press Enter to retry, or Control-D to exit)
Please type another input file name:
! Emergency stop.
<*> doc.dtx
No pages of output.
Transcript written on texput.log.
我错过了什么？如何成功运行此命令？
$ dpkg -l | grep texlive
ii texlive 2014.20141024-2 all TeX Live: A decent selection of the TeX Live packages
ii texlive-base 2014.20141024-2 all TeX Live: Essential programs and files
ii texlive-binaries 2014.20140926.35254-6 amd64 Binaries for TeX Live
ii texlive-extra-utils 2014.20141024-1 all TeX Live: TeX auxiliary programs
ii texlive-font-utils 2014.20141024-1 all TeX Live: Graphics and font utilities
ii texlive-fonts-recommended 2014.20141024-2 all TeX Live: Recommended fonts
ii texlive-fonts-recommended-doc 2014.20141024-2 all TeX Live: Documentation files for texlive-fonts-recommended
ii texlive-generic-recommended 2014.20141024-2 all TeX Live: Generic recommended packages
ii texlive-latex-base 2014.20141024-2 all TeX Live: LaTeX fundamental packages
ii texlive-latex-base-doc 2014.20141024-2 all TeX Live: Documentation files for texlive-latex-base
ii texlive-latex-recommended 2014.20141024-2 all TeX Live: LaTeX recommended packages
ii texlive-latex-recommended-doc 2014.20141024-2 all TeX Live: Documentation files for texlive-latex-recommended
ii texlive-pictures 2014.20141024-2 all TeX Live: Graphics, pictures, diagrams
ii texlive-pictures-doc 2014.20141024-2 all TeX Live: Documentation files for texlive-pictures
ii texlive-pstricks 2014.20141024-1 all TeX Live: PSTricks
ii texlive-pstricks-doc 2014.20141024-1 all TeX Live: Documentation files for texlive-pstricks