Command+U

Upload a file

Alt+Up Arrow

Previous channel or direct message in left hand sidebar

Alt+Down Arrow

Next channel or direct message in left hand sidebar

Alt+Shift+Up Arrow

Previous channel or direct message in left hand sidebar with unread messages

Alt+Shift+Down Arrow

Next channel or direct message in left hand sidebar with unread messages

Command+K

Open a quick channel switcher dialog

Command+Shift+A

Open account settings

Command+Shift+M

Open recent mentions

Command+Up Arrow

Reprint previous message or slash command you entered

Command+Down Arrow Arrow

Reprint next message or slash command you entered

Up Arrow

Edit your last message in the current channel

@character+Tab

Autocomplete @username beginning with character

~character+Tab

Autocomplete channel beginning with character

:character+Tab

Autocomplete emoji beginning with character

/echo message delay in seconds

Post a message as yourself, optionally adding a delay

/join channel-name

Join a channel

/logout

Log out of Mattermost

/me message

Post a message as yourself in italics

/shrug

Post a message as yourself followed by ¯\_(ツ)_/¯

/msg @username message

Send a direct message to a user

/collapse

Collapse all link previews

/expand

Expand all link previews

/invite_people name@domain.com ...

Send an email invitation to listed addresses

/away

Set your status away

/offline

Set your status as offline

/online

Set your status as online

/shortcuts

Displays a list of aII keyboard shortcuts