/usr/share/doc-base/zsh is in zsh-doc 5.4.2-3ubuntu3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 | Document: zsh
Title: Z Shell Manual
Author: Z-Shell workers
Abstract: This guide documents Zsh, a freely available UNIX command
interpreter (shell), which of the standard shells most closely
resembles the Korn shell (ksh), although it is not completely
compatible.
Section: Shells
Format: info
Index: /usr/share/info/zsh.info.gz
Files: /usr/share/info/zsh.info*
Format: HTML
Index: /usr/share/doc/zsh-doc/html/index.html
Files: /usr/share/doc/zsh-doc/html/*.html
Format: PDF
Files: /usr/share/doc/zsh-doc/zsh.pdf
|