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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:: 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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