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Usage: arc

[ ping [ NETWORK ] [ <ip address> | <hostname> ] |

http [ NETWORK ] <url> |

dns [ NETWORK ] <domain> |

proxy <url> |

list [ networks ] |

stats [ sockets | traffic ]

]

ping: check the reachability of a host or IP address.

http: do a GET request to an URL and print the response header.

dns: perform a DNS lookup of a domain name.

proxy: resolve the current proxy configuration for a given URL.

list networks: show properties of all networks connected in Android.

stats sockets: show TCP connect and DNS statistics by Android Apps.

stats traffic: show traffic packet statistics by Android Apps.

If NETWORK is not specified, the default network is used.

autest [--scheduled]

Trigger an auto-update against a **test** update server.

WARNING: This may update to an untested version of ChromeOS which was never

intended for end users!

The --scheduled option fakes a scheduled update.

authpolicy_debug <level>

Set authpolicy daemon debugging level.

<level> can be 0 (quiet), 1 (taciturn), 2 (chatty), or 3 (verbose).

battery_firmware <info|check|update>

info : Query battery info.

check : Check whether the AC adapter is connected.

Also check whether the battery firmware is the latest.

update : Trigger battery firmware update.

battery_test [<test length>]

Tests battery discharge rate for given number of seconds. Without an argument,

defaults to 300 seconds.

Enters a Bluetooth debugging console.

builtin_corpssh <enable|disable>

Enable or disable CorpSSH support for the built-in gnubby.

ccd_pass

When prompted, set or clear CCD password (use the word 'clear' to clear

the password).

chaps_debug [start|stop|<log_level>]

Sets the chapsd logging level. No arguments will start verbose logging.

connectivity

Shows connectivity status. "connectivity help" for more details

cras [ enable <flag> | disable <flag> | telephony <event> [arg] ]

Interact with CRAS(CrOS Audio Server) to set flags or trigger events.

Subcommands:

enable/disable <flag>:

Enable or disable feature flag inside CRAS.

Available flags:

- wbs: Turn on this flag to make CRAS try to use wideband speech mode in

Bluetooth HFP, if both the Bluetooth controller and peripheral supports

this feature.

- noise_cancellation: Turn on this flag to enable noise cancellation

processing to input devices who support noise cancellation.

Notice: The flag changes made through this command do not persist after

reboot.

telephony <event> [args...]:

Trigger a telephony event pass to CRAS in Bluetooth HFP.

Available events:

- IncomingCall <PhoneNumber>: Make a call from external line.

Ex: $ cras telephony IncomingCall 12345678

- AnswerCall: Answer the call.

- TerminateCall: Terminate the call.

- SetDialNumber [DailNumber]: Set the last dialed number recorded. Clear

the recorded number if no DailNumber is provided.

- SetBatteryLevel <BatteryLevel>: Set and transfer the battery level to

HF. The BatteryLevel should range from 0 to 5.

- SetSignalStrength <SignalStrength>: Set and transfer the signal strength

to HF. The SignalStrength should range from 0 to 5.

- SetServiceAvailability <0/1>: Set if the service is available or not.

- SetCallheld <CallHeldIndicator>: Set the callheld indicator.

CallHeldIndicator:

0 = No calls held

1 = Call is placed on hold or active/held calls swapped

(The AG has both an active AND a held call)

2 = Call on hold, no active call

- SetCallsetup <CallSetupIndicator>: Set the callsetup indicator.

CallSetupIndicator:

0 = No call setup in progress

1 = Incoming call setup in progress

2 = Outgoing call setup in dialing state

3 = Outgoing call setup in alerting state

- SetCall <CallIndicator>: Set the call indicator.

CallIndicator:

0 = No call (held or active)

1 = Call is present (active or held)

diag

Usage: [list|routine]

display_debug

A tool to assist with collecting logs when reproducing display related issues.

Subcommands:

trace_start Usage: display_debug trace_start

Increase size and verbosity of logging through drm_trace.

trace_stop Usage: display_debug trace_stop

Reset size and verbosity of logging through drm_trace to defaults.

trace_annotate Usage: display_debug trace_annotate <message>

Append |message| to the drm_trace log.

diagnose Usage: display_debug diagnose

Give a sequence of steps to assist in debugging display issues.

dlc_install <dlc-id>

Trigger a DLC installation against a **test** update server.

The **test** update server will serve signed DLC payloads which will only

successfully install if signed and verifiable. Otherwise, installations will

fail. The magical string 'autest' is passed into update_engine during this

installation, which will make requests against QA Omaha server and not the

production Omaha server.

WARNING: This may install an untested version of the DLC which was never

intended for end users!

Usage: dmesg [options]

-d, --show_delta

Display the timestamp and the time delta

spent between messages

-H, --human

Enable human-readable output.

-k, --kernel

Print kernel messages.

-L, --color

Colorize the output.

-p, --force-prefix

Add facility, level or timestamp

information to each line of a multi-line message.

-r, --raw

Print the raw message buffer.

-T, --ctime

Print human-readable timestamps.

-t, --notime

Do not print kernel's timestamps.

-u, --userspace

Print userspace messages.

-x, --decode

Decode facility and level (priority) numbers

to human-readable prefixes.

dump_emk

Show the EMK (Enterprise Machine Key).

enroll_status [--mode] [--domain] [--realm] [--user]

Displays device enrollment information.

evtest

Run evtest in safe mode.

help: unknown command 'exit'

ff_debug

Usage: ff_debug [<tag_expression>]|[--reset]|[--help]|[--list_valid_tags]|[--level <level>]

ff_debug adds and removes debug tags for flimflam.

Current debug settings are displayed if no parameters are provided

<tag_expression> is defined in boolean notation using <debug_tag> separated

by an operator [+-], where + and - imply adding and removing of the tag immediately

following the operator. An expression beginning with either operators [+-]

takes the existing tags and modifies them appropriately. Otherwise, the existing tags

are replaced by those specified in the command.

<debug_tag> can be listed using the --list_valid_tags

e.g.: ff_debug network+wifi

Sets debug tags to network and wifi

e.g.: ff_debug +network-service

Adds network and removes service tags from the existing debug settings

--list_valid_tags : Displays all valid tags

--level: Displays or sets current debug level for logging

All messages at, or above, the current log level are logged. Normal log

levels range from 4 (LOG_FATAL) to 0 (LOG_INFO). In addition VERBOSE log

levels are available starting at -1.

e.g.: ff_debug --level 4

Logs only FATAL messages.

e.g.: ff_debug --level 0

Logs INFO, WARNING, ERROR, ERROR_REPORT, and FATAL messages.

e.g.: ff_debug --level -4

Logs everything that "--level 0" does, plus SLOG(<tag>, <n>) messages,

where <tag> has been enabled for logging, and <n> <= 4. (NOTE: you must

negate SLOG levels for use with ff_debug. In this example, SLOG(<tag>, 4)

maps to "--level -4".)

--reset : Removes all tagging

--help : Displays this output

free [options]

Display free/used memory info

gesture_prop [ devices | list <device ID> | get <device ID> <property name> | set <device ID> <property name> <value> ]

Read and change gesture properties for attached input devices. The "Enable

gesture properties D-Bus service" flag must be enabled for this command to

work.

For more details, see:

https://chromium.googlesource.com/chromiumos/platform/gestures/+/HEAD/docs/gesture_properties.md

Subcommands:

devices, devs:

List the devices managed by the gestures library, with their numeric IDs.

list <device ID>:

List the properties for the device with the given ID.

get <device ID> <property name>:

Get the current value of a property. Property names containing spaces

should be quoted. For example:

$ gesture_prop get 12 "Mouse CPI"

set <device ID> <property name> <value>:

Set the value of a property. Values use the same syntax as dbus-send

(https://dbus.freedesktop.org/doc/dbus-send.1.html#description), and

should either be arrays or strings. For example:

$ gesture_prop set 12 "Mouse CPI" array:double:500

$ gesture_prop set 12 "Log Path" string:/tmp/foo.txt

help [command]

Display general help, or details for a specific command.

help_advanced

Display the help for more advanced commands, mainly used for debugging.

ipaddrs [-4] [-6]

Display IP addresses.

-4: Only show IPv4 addresses.

-6: Only show IPv6 addresses.

meminfo

Display detailed memory statistics

memory_test

Performs extensive memory testing on the available free memory.

modem <command> [args...]

Interact with the 3G modem. Run "modem help" for detailed help.

network_diag

This command is disabled pending removal.

Please see https://issuetracker.google.com/267537630

p2p_update [enable|disable] [--num-connections] [--show-peers]

Enables or disables the peer-to-peer (P2P) sharing of updates over the local

network. This will both attempt to get updates from other peers in the

network and share the downloaded updates with them. Run this command without

arguments to see the current state. Additional switches will display number

of connections and P2P peers.

Usage: packet_capture [options]

--device <device>

--max-size <max size in MiB>

--frequency <frequency>

--ht-location <above|below>

--vht-width <80|160>

--monitor-connection-on <monitored_device>

Start packet capture. Start a device-based capture on <device>,

or do an over-the-air capture on <frequency> with an optionally

provided HT channel location or VHT channel width. An over-the-air

capture can also be initiated using the channel parameters of a

currently connected <monitored_device>. Note that over-the-air

captures are not available with all 802.11 devices. Set <max_size>

to stop the packet capture if the output .pcap file size exceedes this

limit. Only device-based capture options (--device and --max-size) are

available in verified mode. Switch to developer mode to use other

options.

ping [-4] [-6] [-c count] [-i interval] [-n] [-s packetsize] [-W waittime] <destination>

Send ICMP ECHO_REQUEST packets to a network host. If <destination> is "gw"

then the next hop gateway for the default route is used.

Default is to use IPv4 [-4] rather than IPv6 [-6] addresses.

printscan_debug

A tool to assist with collecting logs when reproducing printing and scanning related issues.

Subcommands:

start Usage: printscan_debug start [all|scanning|printing]

Start collecting printscan debug logs.

stop Usage: printscan_debug stop

Stop collecting printscan debug logs.

rlz < status | enable | disable >

Enable or disable RLZ. See this site for details:

http://dev.chromium.org/developers/design-documents/extensions/proposed-changes/apis-under-development/rlz-api

rollback

Attempt to rollback to the previous update cached on your system. Only

available on non-stable channels and non-enterprise enrolled devices.

Please note that this will powerwash your device.

route [-4] [-6] [--all]

Display the routing tables.

-4: Only show IPv4 routes.

-6: Only show IPv6 routes.

--all: Show all routing tables.

set_apn [-c] [-n <network-id>] [-u <username>] [-p <password>] <apn>

Set the APN to use when connecting to the network specified by <network-id>.

If <network-id> is not specified, use the network-id of the currently

registered network.

The -c option clears the APN to be used, so that the default APN will be used

instead.

set_arpgw <true | false>

Turn on extra network state checking to make sure the default gateway

is reachable.

set_cellular_ppp [-c] [-u <username>] [-p <password>]

Set the PPP username and/or password for an existing cellular connection.

If neither -u nor -p is provided, show the existing PPP username for

the cellular connection.

The -c option clears any existing PPP username and PPP password for an

existing cellular connection.

set_time <time string>

Sets the system time if the the system has been unable to get it from the

network. The <time string> uses the format of the GNU coreutils date command.

set_wake_on_lan <true | false>

Enable or disable Wake on LAN for Ethernet devices. This command takes

effect after re-connecting to Ethernet and is not persistent across system

restarts.

storage_test_1

Performs a short offline SMART test.

storage_test_2

Performs an extensive readability test.

swap [ enable <size (MB)> | disable | start | stop | status ]

Change kernel memory manager parameters

(FOR EXPERIMENTS ONLY --- USE AT OWN RISK)

"swap status" (also "swap" with no arguments) shows the values of various

memory manager parameters and related statistics.

The enable/disable options enable or disable compressed swap (zram)

persistently across reboots, and take effect at the next boot. The enable

option takes the size of the swap area (in megabytes before compression).

If the size is omitted, the factory default is chosen.

The start/stop options turn swap on/off immediately, but leave the settings

alone, so that the original behavior is restored at the next boot.

WARNING: if swap is in use, turning it off can cause the system to

temporarily hang while the kernel frees up memory. This can take

a long time to finish.

sync

Run the sync command

syslog <message>

Logs a message to syslog (the system log daemon).

time_info

Returns the current synchronization state for the time service.

top

Run top.

tracepath [-4] [-6] [-n] <destination>[/port]

Trace the path/route to a network host.

Default is to trace IPv4 [-4] rather than IPv6 [-6] targets.

u2f_flags <u2f | g2f>[, user_keys, verbose]

### IMPORTANT: The U2F feature is experimental and not suitable for

### general production use in its current form. The current

### implementation is still in flux and some features (including

### security-relevant ones) are still missing. You are welcome to

### play with this, but use at your own risk. You have been warned.

Set flags to override the second-factor authentication daemon configuration.

u2f: Always enable the standard U2F mode even if not set in device policy.

g2f: Always enable the U2F mode plus some additional extensions.

user_keys: Enable user-specific keys.

verbose: Increase the daemon logging verbosity in /var/log/messages.

uname [-a|-s|-n|-r|-v|-m|-p|-i|-o]

Display system info

upload_crashes

Uploads available crash reports to the crash server.

upload_devcoredumps [enable|disable]

Enable or disable the upload of devcoredump reports.

uptime

Display uptime/load info

verify_ro

Verify AP and EC RO firmware on a ChromeOS device connected over SuzyQ

cable, if supported by the device.

USAGE: vmc

[ start [--enable-gpu] [--enable-vulkan] [--enable-big-gl] [--enable-virtgpu-native-context] [--enable-audio-capture] [--untrusted] [--extra-disk PATH] [--kernel PATH] [--initrd PATH] [--writable-rootfs] [--kernel-param PARAM] [--bios PATH] [--timeout PARAM] [--oem-string STRING] <name> |

stop <name> |

launch <name> |

create [-p] [--size SIZE] <name> [<source media> [<removable storage name>]] [-- additional parameters] |

create-extra-disk --size SIZE [--removable-media] <host disk path> |

adjust <name> <operation> [additional parameters] |

destroy [-y] <name> |

disk-op-status <command UUID> |

export [-d] [-f] <vm name> <file name> [<removable storage name>] |

import [-p] <vm name> <file name> [<removable storage name>] |

resize <vm name> <size> |

list |

logs <vm name> |

share <vm name> <path> |

unshare <vm name> <path> |

container <vm name> <container name> [ (<image server> <image alias>) | (<rootfs path> <metadata path>)] [--privileged <true/false>] [--timeout PARAM] |

update-container-devices <vm_name> <container_name> (<vm device>:<enable/disable>)... |

usb-attach <vm name> <bus>:<device> [<container name>] |

usb-detach <vm name> <port> |

usb-list <vm name> |

pvm.send-problem-report [-n <vm name>] [-e <reporter's email>] <description of the problem> |

--help | -h ]

vmstat [-a|-d|-f|-m|-n|-s|-w] [delay [count]]

Report virtual memory statistics

vsh <vm_name> [<container_name>]

Connect to a shell inside the VM <vm_name>, or to a shell inside the container

<container_name> within the VM <vm_name>.

wifi_fw_dump

Manually trigger a WiFi firmware dump. This command will currently only

complete successfully if the intel-wifi-fw-dumper package is present on the

device with USE=iwlwifi_dump enabled.

wifi_power_save < status | enable | disable >

Enable or disable WiFi power save mode. This command is not persistent across

system restarts.