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40.

The install command installs the named snaps on the system.

To install multiple instances of the same snap, append an underscore and a
unique identifier (for each instance) to a snap's name.

Parallel instances are installed with --unaliased passed implicitly to avoid
conflicts with existing installs. This behaviour can be altered by passing
--prefer which will enable all aliases of the given snap in preference to
conflicting aliases of other snaps whose automatic aliases will be disabled and
manual aliases will be removed.

With no further options, the snaps are installed tracking the stable channel,
with strict security confinement. All available channels of a snap are listed in
its 'snap info' output.

When --revision is used, a later refresh will typically undo the revision
override, taking the snap back to the current revision of the channel it's
tracking.

Use --name to set the instance name when installing from snap file.

43.

The is-connected command returns success if the given plug or slot of the
calling snap is connected, and failure otherwise.

$ snapctl is-connected plug
$ echo $?
1

Snaps can only query their own plugs and slots - snap name is implicit and
implied by the snapctl execution context.

The --list option lists all connected plugs and slots.

The --pid and --aparmor-label options can be used to determine whether
a plug or slot is connected to the snap identified by the given
process ID or AppArmor label. In this mode, additional failure exit
codes may be returned: 10 if the other snap is not connected but uses
classic confinement, or 11 if the other process is not snap confined.

The --pid and --apparmor-label options may only be used with slots of
interface type "pulseaudio", "audio-record", or "cups-control".

45.

The kmod command handles loading and unloading of kernel modules.

53.

The model command returns the active model assertion information for this
device.

By default, the model identification information is presented in a structured,
yaml-like format, but this can be changed to json by using the --json flag.

54.

The mount command mounts the given source onto the given destination path,
provided that the snap has a plug for the mount-control interface which allows
this operation.

68.

The refresh command updates the specified snaps, or all snaps in the system if
none are specified.

With no further options, the snaps are refreshed to the current revision of the
channel they're tracking, preserving their confinement options. All available
channels of a snap are listed in its 'snap info' output.

When --revision is used, a later refresh will typically undo the revision
override.

Hold (--hold) is used to postpone snap refresh updates for all snaps when no
snaps are specified, or for the specified snaps.

When no snaps are specified --hold is only effective on auto-refreshes and will
not block either general refresh requests from 'snap refresh' or specific snap
requests from 'snap refresh target-snap'.

When snaps are specified --hold is effective on both their auto-refreshes
and general refresh requests from 'snap refresh'. However, specific snap
requests from 'snap refresh target-snap' remain unblocked and will proceed.

69.

The remodel command changes the model assertion of the device, either to a new
revision or a full new model.

In the process it applies any implied changes to the device: new required
snaps, new kernel or gadget etc.

Snaps and assertions are downloaded from the store unless they are provided as
local files specified by --snap and --assertion options. If using these
options, it is expected that all the needed snaps and assertions are provided
locally, otherwise the remodel will fail.

87.

The set command sets the provided configuration options as requested.

$ snapctl set username=frank password=$PASSWORD

All configuration changes are persisted at once, and only after the hook
returns successfully.

Nested values may be modified via a dotted path:

$ snapctl set author.name=frank

Configuration option may be unset with exclamation mark:
$ snapctl set author!

Plug and slot attributes may be set in the respective prepare and connect hooks
by naming the respective plug or slot:

$ snapctl set :myplug path=/dev/ttyS0

98.

The system-mode command returns information about the device's current system mode.

This information includes the mode itself and whether the model snaps have been installed from the seed (seed-loaded). The system mode is either run, recover, or install.

Retrieved information can also include "factory mode" details: 'factory: true' declares whether the device booted an image flagged as for factory use. This flag can be set for convenience when building the image. No security sensitive decisions should be based on this bit alone.

The output is in YAML format. Example output:
$ snapctl system-mode
system-mode: install
seed-loaded: true
factory: true