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3.

If the first argument passed into get is an aspect identifier matching the
format <account-id>/<bundle>/<aspect>, get will use the aspects configuration
API. In this case, the command returns the data retrieved from the requested
dot-separated aspect paths.

4.

If the first argument passed into set is an aspect identifier matching the
format <account-id>/<bundle>/<aspect>, set will use the aspects configuration
API. In this case, the command sets the values as provided for the dot-separated
aspect paths.

5.

If the first argument passed into unset is an aspect identifier matching the
format <account-id>/<bundle>/<aspect>, unset will use the aspects configuration
API. In this case, the command removes the data stored in the provided
dot-separated aspect paths.

12.

The aliases command lists all aliases available in the system and their status.

$ snap aliases <snap>

Lists only the aliases defined by the specified snap.

31.

The fde-setup-request command is used inside the fde-setup hook. It will
return information about what operation for full-disk encryption is
requested and auxiliary data to complete this operation.

The fde-setup hook should do what is requested and then call
"snapctl fde-setup-result" and pass the result data to stdin.

Here is an example for how the fde-setup hook is called initially:
$ snapctl fde-setup-request
{"op":"features"}
$ echo '{"features": []}' | snapctl fde-setup-result

Alternatively the hook could reply with:
$ echo '{"error":"hardware-unsupported"}' | snapctl fde-setup-result

And then it is called again with a request to do the initial key setup:
$ snapctl fde-setup-request
{"op":"initial-setup", "key": "key-to-seal"}
$ echo "{"sealed-key":"$base64_encoded_sealed_key"}" | snapctl fde-setup-result

32.

The fde-setup-result command sets the result data for a fde-setup hook
reading it from stdin.

For example:
When the fde-setup hook is called with "op":"features:
$ echo '{"features": []}' | snapctl fde-setup-result

When the fde-setup hook is called with "op":"initial-setup":
$ echo "{"sealed-key":"$base64_encoded_sealed_key"}" | snapctl fde-setup-result

36.

The get command prints configuration options for the current snap.

$ snapctl get username
frank

If multiple option names are provided, a document is returned:

$ snapctl get username password
{
"username": "frank",
"password": "..."
}

Nested values may be retrieved via a dotted path:

$ snapctl get author.name
frank

Values of interface connection settings may be printed with:

$ snapctl get :myplug usb-vendor
$ snapctl get :myslot path

This will return the named setting from the local interface endpoint,
regardless whether it's a plug or a slot. Returning the setting from the
connected snap's endpoint is also possible by requesting the setting explicitly
with optional --plug and --slot command options:

$ snapctl get :myplug --slot usb-vendor

This requests the "usb-vendor" setting from the slot that is connected to
"myplug".

37.

The get command prints configuration options for the provided snap.

$ snap get snap-name username
frank

If multiple option names are provided, the corresponding values are returned:

$ snap get snap-name username password
Key Value
username frank
password ...

Nested values may be retrieved via a dotted path:

$ snap get snap-name author.name
frank

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".