From bfa27a8c476b8f55934ef19dc86402add51d368c Mon Sep 17 00:00:00 2001
From: Christian Poessinger <christian@poessinger.com>
Date: Mon, 1 Oct 2018 12:18:48 +0200
Subject: Added installation and CLI help from WiKi

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 docs/ch02-cli.rst | 85 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
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 create mode 100644 docs/ch02-cli.rst

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+Command-Line Interface
+======================
+
+The VyOS CLI comprises an **operational mode** and a **configuration mode**.
+
+Operational mode allows for commands to perform operational system tasks and
+view system and service status, while configuration mode allows for the
+modification of system configuration. The command tree page lists available
+commands and their functions.
+
+The CLI provides a built-in help system. In the CLI the **[?]** key may be used
+to display available commands. The **[tab]** key can be used to auto-complete
+commands and will present the help system upon a conflict or unknown value.
+
+For example typing `sh` followed by the **[tab]** key will complete to `show`.
+Pressing **[tab]** a second time will display the possible sub-commands of the
+`show` command.
+
+.. code-block:: sh
+
+  vyos@vyos:~$ s[tab]
+  set   show
+  vyos@vyos:~$
+
+Example showing possible show commands:
+
+.. code-block:: sh
+
+  vyos@vyos:~$ show [tab]
+  Possible completions:
+    arp           Show Address Resolution Protocol (ARP) information
+    bridge        Show bridging information
+    cluster       Show clustering information
+    configuration Show running configuration
+    conntrack     Show conntrack entries in the conntrack table
+    conntrack-sync
+                  Show connection syncing information
+    date          Show system date and time
+    dhcp          Show Dynamic Host Configuration Protocol (DHCP) information
+    dhcpv6        Show status related to DHCPv6
+    disk          Show status of disk device
+    dns           Show Domain Name Server (DNS) information
+    file          Show files for a particular image
+    firewall      Show firewall information
+    flow-accounting
+                  Show flow accounting statistics
+    hardware      Show system hardware details
+    history       show command history
+    host          Show host information
+    incoming      Show ethernet input-policy information
+  : q
+  vyos@vyos:~$
+
+When the output of a command results in more lines than can be displayed on the
+terminal screen the output is paginated as indicated by a : prompt.
+
+When viewing in page mode the following commands are available:
+ * **[q]** key can be used to cancel output
+ * **[space]** will scroll down one page
+ * **[b]** will scroll back one page
+ * **[return]** will scroll down one line
+ * **[up-arrow]** and **[down-arrow]** will scroll up or down one line at a
+   time respectively
+ * **[left-arrow]** and **[right-arrow]** can be used to scroll left or right
+   in the event that the output has lines which exceed the terminal size.
+
+To enter configuration mode use the `configure` command:
+
+.. code-block:: sh
+
+  vyos@vyos:~$ configure
+  [edit]
+  vyos@vyos:~#
+
+Note that the prompt changes from `$` to `#`. To exit configuration mode, type
+`exit`.
+
+.. code-block:: sh
+
+  vyos@vyos:~# exit
+  exit
+  vyos@vyos:~$
+
+See the configuration section of this document for more information on
+configuration mode.
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