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97.

The switch command switches the given snap to a different channel without
doing a refresh. All available channels of a snap are listed in
its 'snap info' output.

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

99.

The tasks command displays a summary of tasks associated with an individual
change.

100.

The try command installs an unpacked snap into the system for testing purposes.
The unpacked snap content continues to be used even after installation, so
non-metadata changes there go live instantly. Metadata changes such as those
performed in snap.yaml will require reinstallation to go live.

If snap-dir argument is omitted, the try command will attempt to infer it if
either snapcraft.yaml file and prime directory or meta/snap.yaml file can be
found relative to current working directory.

101.

The umount command unmounts the given mount point, which must have been
previously created with "snapctl mount".

102.

The unalias command removes a single alias if the provided argument is a manual
alias, or disables all aliases of a snap, including manual ones, if the
argument is a snap name.

103.

The unset command removes the provided configuration options as requested.

[tab]$ snap unset snap-name name address

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

Nested values may be removed via a dotted path:

[tab]$ snap unset snap-name user.name

104.

The unset command removes the provided configuration options as requested.

$ snapctl unset name address

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

Nested values may be removed via a dotted path:

$ snapctl unset user.name

105.

The userd command starts the snap user session service.

106.

The validate command lists or applies validation sets that state which snaps
are required or permitted to be installed together, optionally constrained to
fixed revisions.

A validation set can either be in monitoring mode, in which case its constraints
aren't enforced, or in enforcing mode, in which case snapd will not allow
operations which would result in snaps breaking the validation set's constraints.