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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.

48.

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

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.

56.

The pack command packs the given snap-dir as a snap and writes the result to
target-dir. If target-dir is omitted, the result is written to current
directory. If both source-dir and target-dir are omitted, the pack command packs
the current directory.

The default file name for a snap can be derived entirely from its snap.yaml, but
in some situations it's simpler for a script to feed the filename in. In those
cases, --filename can be given to override the default. If this filename is
not absolute it will be taken as relative to target-dir.

When used with --check-skeleton, pack only checks whether snap-dir contains
valid snap metadata and raises an error otherwise. Application commands listed
in snap metadata file, but appearing with incorrect permission bits result in an
error. Commands that are missing from snap-dir are listed in diagnostic
messages.

58.

The portal-info command returns information about a process in keyfile format.

This command is used by the xdg-desktop-portal service to retrieve
information about snap confined processes.

62.

The quota command shows information about a quota group, including the set of
snaps and any sub-groups it contains, as well as its resource constraints and
the current usage of those constrained resources.

63.

The quotas command shows all quota groups.

64.

The reboot command can used from allowed hooks to control the reboot behavior of the system.

Currently it can only be invoked from gadget install-device during UC20 install mode. After invoking it from install-device with --halt or --poweroff the device will not reboot into run mode after finishing install mode but will instead either halt or power off. From install-device the effect is therefore not immediate but delayed until the end of installation itself.