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37.

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.

With no further options, the snaps are installed tracking the stable channel,
with strict security confinement.

Revision choice via the --revision override requires the user to
have developer access to the snap, either directly or through the
store's collaboration feature, and to be logged in (see 'snap help login').

Note that a later refresh will typically undo a 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.

39.

The interfaces command lists interfaces available in the system.

By default all slots and plugs, used and offered by all snaps, are displayed.

$ snap interfaces <snap>:<slot or plug>

Lists only the specified slot or plug.

$ snap interfaces <snap>

Lists the slots offered and plugs used by the specified snap.

$ snap interfaces -i=<interface> [<snap>]

Filters the complete output so only plugs and/or slots matching the provided
details are listed.

NOTE this command is deprecated and has been replaced with the 'connections'
command.

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.

48.

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.

49.

The okay command acknowledges the warnings listed with 'snap warnings'.

Once acknowledged a warning won't appear again unless it re-occurrs and
sufficient time has passed.

50.

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.

52.

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.

54.

The prepare-image command performs some of the steps necessary for
creating device images.

For core images it is not invoked directly but usually via
ubuntu-image.

For preparing classic images it supports a --classic mode

56.

The reboot command reboots the system into a particular mode of the selected
recovery system.

When called without a system label and without a mode it will just
trigger a regular reboot.

When called without a system label but with a mode it will use the
current system to enter the given mode.

Note that "recover" and "run" modes are only available for the
current system.

57.

The recovery command lists the available recovery systems.

With --show-keys it displays recovery keys that can be used to unlock the encrypted partitions if the device-specific automatic unlocking does not work.