1-先进但轻巧的技术
手册页是平的。
info 是一棵树。
两者都是基于文本的，因此它们可以在低级系统开发中使用（与http不同，http需要使用完整的GUI和浏览器才能使用。）
这也很有用，因为linux可以在许多低资源机器上运行，例如，可以在Atmel的Arduino上运行的东西info。
（历史记录：info类似于gopher，如果您还记得的话。那是我们刚进入GUI OS之前的情况，并且互联网爆炸了。我记得gopher在查找信息方面非常有效，而且速度很快简单易用。它易于扩展，完全基于文本且速度很快。）
手册页不能有可操作的超链接。 （这在这项技术中是不可能的。）
info可以并且确实具有从节点到节点或从节点到叶子的许多可操作链接，这使快速浏览大型手册变得容易得多。
2-包含手册页中找不到的内容
许多标准软件包也有一个姐妹-doc软件包。通常，此内容只能在内部找到info。
这些文档包在信息中添加了小册子，并带有小节和小节。在info术语中，这些称为nodes，节点可以nodes在树结构中包含其他节点。
有一些命令可以爬到树上，下面是一些示例：
- 上一节，例如从第2.1节到第2节
- 下一节（即，沿页面顶部的分支提示移动），例如，从第2节到第2.1节，以及（假设没有第2.2节），再到第3节
- 在一个部分的右边，例如从第2节直接转到第3节，跳过第2.1节
如果您正在阅读并且逐行向下滚动，则将访问每本小册子的所有部分。
重要命令
升 - 回 -小写'L'，如升 AST。就像您的网络浏览器上的“ 后退”按钮一样。-返回此窗口中看到的最后一个节点（最初我们只有一个窗口）。 哇，我们也可以将文档窗口分成两半！
d - 我的人 -进入主“ d irectory”节点。-这是INFO树的顶部。包含到家庭的链接：
牛逼 - 我的家人 -转到牛逼本文件的运算节点。-通常是目录
ü - 我的父母 -转到ü P上水平。例如从第2.1节转到第2节。
ñ - 我的兄弟姐妹 -转到ñ在这个层面上扩展节点。例如第2节->第3节（不是2.1）
p - 我的兄弟姐妹 -转到p在这个层面上revious节点。例如第3节->第2节
] - 我的孩子 -转到文档中的下一个节点，例如，第2节->第2.1节
[ - 我的孩子 -转到文档中的上一个节点，例如，第2.1节->第2节
我也不太了解为什么要使用信息。我以前曾涉猎它，最初发现它是老式的。但是因为我需要更多有关autoconf项目的信息，并且有人向我建议这是该文档所在的地方，所以最近我又看了一眼。
我要做的第一件事是弄清楚如何更好地导航。我发现H给予的帮助几乎无济于事。直到我注意到我可以向下滚动到该帮助为止，..但随后出现了太多混乱。
因此，我复制了此帮助并将其粘贴到Gnote中，并开始尝试了解其info工作原理。
随着我学到更多，我为自己改写了他们的帮助。我想知道它们的全部命令是什么，以及它们是如何分类的。
我注意到许多按键都是重复的，有两种或三种方式可以执行给定命令。 我还注意到，这一切看起来都非常像emacs。
这是我的信息命令速查表：
HELP - info - commands
#####################################################################################################################################################
Short list - 'basic' Info command keys (see below for full list)
C-g Cancel the current operation.
H Close this help window. (toggle help window)
q Quit Info altogether.
h Invoke the Info tutorial.
Move in this node
Up Move up one line.
Down Move down one line.
PgUp Scroll backward one screenful. - also backspace
PgDn Scroll forward one screenful. - also space
Home Go to the beginning of this node.
End Go to the end of this node.
TAB Skip to the next hypertext link.
/ Search forward for a specified string.
} Search for next occurrence.
{ Search for previous occurrence.
Move to other nodes
RET Follow the hypertext link under the cursor.
1...9 Pick the first...ninth item in this node's menu.
0 Pick the last item in this node's menu.
l Last in history. Go back to the last node seen in this window (initially we only have one window). (?? history)
d Go to the main 'directory' node. my people
the Info main menu - "This is the top of the INFO tree."
t Go to the top node of this document. my family Generally the table of contents
u Go up one level. my parent e.g. go from Section 2.1, to Section 2.
n Go to the next node on this level. my siblings e.g. section 2 -> section 3 (not 2.1)
p Go to the previous node on this level.
] Go to the next node in the document. my children e.g. section 2 -> section 2.1
[ Go to the previous node in the document. (?siblings)
m <name> Pick a menu item specified by name.
f Follow a cross reference specified by name.
g Go to a node specified by name.
i Search for a specified string in the index (if there is an index), and select the node referenced by the first entry found.
I Synthesize menu of matching index entries. ???
#####################################################################################################################################################
Full list - of commands available in Info windows:
Notes:
M- (meta) is Alt; (also you can use an Esc prefix instead of meta -hwj)
M-C- means hold both Ctrl and Alt down at same time
* Basic commands (listed above)
HELP
* H (get-help-window) Toggle display of help message
* h (get-info-help-node) Visit Info node '(info)Help' (this gets: man info )
CANCEL
* C-g C-x C-g M-C-g (abort-key) Cancel current operation (?? esc)
* q C-c (quit) Quit using Info
C-x C-c (quit) Quit using Info
WINDOWS
C-l (redraw-display) Redraw the display
x C-x 0 (delete-window) Delete the current window
C-x 1 (keep-one-window) Delete all other windows (leaving 1)
C-x 2 (split-window) Split the current window (into 2)
C-x t (tile-windows) Divide the available screen space among the visible windows
C-x ^ (grow-window) Grow (or shrink) this window
C-x o (next-window) Select the next window (other)
C-x C-b (list-visited-nodes) Make a window containing a menu of all of the currently visited nodes
C-x w (toggle-wrap) Toggle the state of line wrapping in the current window
VIEW OTHER FILE
C-x C-f (view-file) Read the name of a file and select it
C-x C-v (view-file) Read the name of a file and select it
SCROLL
C-v (scroll-forward-page-only) Scroll forward in this window staying within node ('v' looks like a down arrow)
M-v (scroll-backward-page-only) Scroll backward in this window staying within node (meta-v is the reverse, or up arrow)
* PgDn SPC (scroll-forward) Scroll forward in this window (at end moving to next node??)
* PgUp DEL C-h (scroll-backward) Scroll backward in this window (at end moving to next node??) (DEL = Backspace or Del)
M-C-v ESC PgDn (scroll-other-window) Scroll the other window
ESC PgUp (scroll-other-window-backward) Scroll the other window backward
CURSOR MOVEMENT (within a 'node' / page)
Right C-f ( forward-char) Move forward a character
Left C-b (backward-char) Move backward a character
M-b (backward-word) Move backward a word
M-f ( forward-word) Move forward a word
C-a (beginning-of-line) Move to the start of the line
C-e (end-of-line) Move to the end of the line
* Up C-p (prev-line) Move up to the previous line
* Down C-n (next-line) Move down to the next line
M-r (move-to-window-line) Move the cursor to a specific line of the window
* Home b ESC < (beginning-of-node) Move to the start of this node
* End e ESC > (end-of-node) Move to the end of this node
SEARCHING
/ (search) Read a string and search for it
s (search) Read a string and search for it
? (search-backward) Read a string and search backward for it
R (toggle-regexp) Toggle the usage of regular expressions in searches
S (search-case-sensitively) Read a string and search for it case-sensitively
* } C-x n (search-next) Repeat last search in the same direction
* { C-x N (search-previous) Repeat last search in the reverse direction
C-s (isearch-forward) Search interactively for a string as you type it
C-r (isearch-backward) Search interactively for a string as you type it
M-/ (tree-search) Search this node and subnodes for a string.
M-} (tree-search-next) Go to next match in Info sub-tree
M-{ (tree-search-previous) Go to previous match in Info sub-tree
JUMP TO NODE CROSS REFERENCES (underlined links to nodes)
* TAB (move-to-next-xref) Move to the next cross reference
BackTab M-TAB (move-to-prev-xref) Move to the previous cross reference (Shift-tab)
SELECT A NODE (hyperlink)
* RET (select-reference-this-line) Select reference or menu item appearing on this line
* 1 .. 9 (menu-digit) Select this menu item (link) # in this node's menu (this page's menu)
* 0 (last-menu-item) Select the last menu item (link) in this node's menu (this page's menu)
< (first-node) Select the first node in this file
> (last-node) Select the last node in this file
* d (dir-node) Select the 'dir' node (in all files?) the Info main menu - "This is the top of the INFO tree."
* t (top-node) Select the 'Top' node in this file Generally the table of contents
* u ( up-node) Select the 'Up' node in this file i.e. go from Section 2.1, to Section 2.
* n (next-node) Select the Next node i.e. section 2.1 -> section 2.2
* p (prev-node) Select the Prev node
* g <name> (goto-node) Read a node name and select it
* m <item> (menu-item) Read a menu item and select its node ???
C-x b (select-visited-node) Select a node which has been previously visited in a visible window (c-x=Window, back)
MOVE TO ANOTHER NODE (in the tree)
* [ (global-prev-node) Move backwards or up through node structure (tree within this file)
* ] (global-next-node) Move forwards or down through node structure (tree within this file)
* l (history-node) last - Select the most recently selected node
GET NODE INFORMATION
= (display-file-info) Show full file name of node being displayed
O (goto-invocation-node) Find the node describing program invocation
READ IN NEW MENUS
G <menus> (menu-sequence) Read a list of menus starting from dir and follow them ???
INDEX
* i (index-search) Look up a string in the index for this file (Search for a specified string in the index
(if there is an index), and select the node referenced by the first entry found.
, (next-index-match) Go to the next matching index item from the last 'i' command
* I (virtual-index) List all matches of a string in the index
C-x f (all-files) Show all matching files
FOOTNOTES
* f (xref-item) Read a footnote or cross reference and select its node
r (xref-item) Read a footnote or cross reference and select its node
M-C-f (show-footnotes) Show the footnotes associated with this node in another window
NUMERIC
C-u (universal-argument) Start (or multiply by 4) the current numeric argument
M-- (add-digit-to-numeric-arg) Add this digit to the current numeric argument
M-0 .. M-9 (add-digit-to-numeric-arg) Add this digit to the current numeric argument
MISC
M-x (execute-command) Read a command name in the echo area and execute it ?? pwd and ls don't work
#####################################################################################################################################################
The following text commands can only be invoked via M-x (Alt-x -hwj):
This is a list of longer commands that can be typed, all prefixed with Alt-x:
M-x scroll-forward-set-window Scroll forward in this window and set default window size
M-x scroll-backward-set-window Scroll backward in this window and set default window size
M-x scroll-forward-page-only-set-window Scroll forward in this window staying within node and set default window size
M-x scroll-backward-page-only-set-window Scroll backward in this window staying within node and set default window size
M-x down-line Scroll down by lines
M-x up-line Scroll up by lines
M-x scroll-half-screen-down Scroll down by half screen size
M-x scroll-half-screen-up Scroll up by half screen size
M-x prev-window Select the previous xwindow
M-x set-screen-height <number> Set the height of the displayed window
M-x find-menu Move to the start of this node's menu
M-x visit-menu Visit as many menu items at once as possible
M-x man <name of man page> Read a manpage reference and select it
M-x print-node Pipe the contents of this node through INFO_PRINT_COMMAND
M-x clear-search Clear displayed search matches
M-x describe-key <key combo> Print documentation for KEY (one line of documentation)
M-x where-is Show what to type to execute a given command
M-x describe-command Read the name of an Info command and describe it
M-x index-apropos Grovel all known info file's indices for a string and build a menu (grep widely, and make a menu of what is found)
M-x describe-variable Explain the use of a variable
M-x set-variable Set the value of an Info variable
M-x info-version Display version of Info being run
#####################################################################################################################################################
Commands available in the 'echo' area (i.e. at bottom of screen):
(M- (meta) = Fn (not alt) -hwj)
C-l (redraw-display) Redraw the display
C-g Esc (echo-area-abort) Cancel or quit operation
M-C-g (echo-area-abort) Cancel or quit operation
MOVE
C-a Home (echo-area-beg-of-line) Move to the start of this line
C-e End (echo-area-end-of-line) Move to the end of this line
C-b Left (echo-area-backward) Move backward a character
C-f Right (echo-area-forward) Move forward a character
M-b (echo-area-backward-word) Move backward a word
M-f (echo-area-forward-word) Move forward a word
COMMAND LINE COMPLETIONS
M-? ? (echo-area-possible-completions) List possible completions
M-C-v (echo-area-scroll-completions-window) Scroll the completions window
TAB SPC (echo-area-complete) Insert completion
RET LFD (echo-area-newline) Accept (or force completion of) this line
DELETE/YANK
C-d (echo-area-delete) Delete the character under the cursor
C-h DEL (echo-area-rubout) Delete the character behind the cursor
M-d (echo-area-kill-word) Kill the word following the cursor
M-DEL (echo-area-backward-kill-word) Kill the word preceding the cursor
C-k (echo-area-kill-line) Kill to the end of the line
C-x DEL (echo-area-backward-kill-line) Kill to the beginning of the line
C-y (echo-area-yank) Yank back the contents of the last kill
M-y (echo-area-yank-pop) Yank back a previous kill
INSERT
C-q (echo-area-quoted-insert) Insert next character verbatim
M-TAB (echo-area-tab-insert) Insert a TAB character
TRANSPOSE
C-t (echo-area-transpose-chars) Transpose characters at point (and move ahead by one)
NUMERIC ARGUMENTS ???
C-u (universal-argument) Start (or multiply by 4) the current numeric argument
M-- (add-digit-to-numeric-arg) Add this digit to the current numeric argument
M-0 .. M-9 (add-digit-to-numeric-arg) Add this digit to the current numeric argument
C-x o (next-window) Select the next window