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40.

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".

41.

The keys command lists cryptographic keys that can be used for signing
assertions.

42.

The kmod command handles loading and unloading of kernel modules.

43.

The known command shows known assertions of the provided type.
If header=value pairs are provided after the assertion type, the assertions
shown must also have the specified headers matching the provided values.

44.

The list command displays a summary of snaps installed in the current system.

A green check mark (given color and unicode support) after a publisher name
indicates that the publisher has been verified.

45.

The login command authenticates the user to snapd and the snap store, and saves
credentials into the ~/.snap/auth.json file. Further communication with snapd
will then be made using those credentials.

It's not necessary to log in to interact with snapd. Doing so, however, enables
interactions without sudo, as well as some some developer-oriented features as
detailed in the help for the find, install and refresh commands.

An account can be set up at https://login.ubuntu.com

46.

The logout command logs the current user out of snapd and the store.

47.

The logs command fetches logs of the given services and displays them in
chronological order.

48.

The managed command will print true or false informing whether
snapd has registered users.

49.

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

By default, only the essential model identification information is
included in the output, but this can be expanded to include all of an
assertion's non-meta headers.

The verbose output is presented in a structured, yaml-like format.

Similarly, the active serial assertion can be used for the output instead of the
model assertion.