Select Text to Beginning of Current Line

`Shift` + `Up Arrow`

All hotkeys for Slack (MacOS)

Navigation Controls Zoom in/Zoom out	`Command` + `+` / `Command` + `-`
Navigation Controls Scroll Up	`PgUp`
Navigation Controls Scroll Down	`PgDn`
Navigation Controls Quick Switcher	`Command` + `K`
Navigation Controls Preferences	`Command` + `,`
Navigation Controls Previous Channel Visited	`Command` + `[`
Navigation Controls Next Channel Visited	`Command` + `]`
Navigation Controls Previous Unread Channel	`Option` + `Shift` + `Up Arrow`
Navigation Controls Next Unread Channel	`Option` + `Shift` + `Down Arrow`
Navigation Controls Previous Channel	`Option` + `Up Arrow`
Navigation Controls Next Channel	`Option` + `Down Arrow`
Navigation Controls Open or Close Right Pane	`Command` + `.`
Navigation Controls Direct Message Menu	`Command` + `Shift` + `K`
Navigation Controls Open All Threads view	`Command` + `Shift` + `T`
Navigation Controls Toggle Full Screen View	`Command` + `Shift` + `F`
Navigation Controls Search the current Channel/Conversation	`Command` + `F`
Navigation Controls Starred Item	`Command` + `Shift` + `S`
Navigation Controls Directory	`Command` + `Shift` + `E`
Navigation Controls Activity	`Command` + `Shift` + `M`
Navigation Controls Open list of Keyboard shortcuts	`Command` + `/`
Unread Navigation Toggle Current Channel read/Unread	`R`
Unread Navigation Move between Channels	`Left Arrow` / `Right Arrow`
Unread Navigation Open all Unread View	`Command` + `Shift` + `A`
Unread Navigation Mark Msg as Unread	`Option` + `Click Msg`
Switch Teams(Desktop App Only) Switch to Next Team	`Command` + `Shift` + `]`
Switch Teams(Desktop App Only) Switch to Previous Team	`Command` + `Shift` + `[`
Switch Teams(Desktop App Only) Switch to A Specific team	`Command` + `1..9`
Mark Message Mark All Messages in Current Channel	`Esc`
Mark Message Mark All Messages As Read	`Shift` + `Esc`
Mark Message Set Msg to Oldest Unread Message	`Option` + `Click Msg`
Message Shortcuts Reprint your last slash command in a channel	`Tab`
Message Shortcuts Select Text to Beginning of Current Line	`Shift` + `Up Arrow`
Message Shortcuts Select Text to End of Current Line	`Shift` + `Down Arrow`
Message Shortcuts Add Emoji Reactions to A Message	`Command` + `Shift` + `\`
Message Shortcuts Create a new line in your message	`Shift` + `Enter`
Message Shortcuts Edit Your Last Message	`Up Arrow`
Message Autocomplete Autocomplete Username	`@character` + `Tab`
Message Autocomplete Autocomplete Channel	`#character` + `Tab`
Message Autocomplete Autocomplete Emoji	`:character` + `Tab`
Files and Snippets Upload a File	`Command` + `U`
Files and Snippets Create a new snippet	`Command` + `Enter`
Call Actions Mute On/Off	`M`
Call Actions Video On/Off	`V`
Call Actions Show Invite List	`A`
Call Actions View Channel sharing Options	`S`
Call Actions View and Select Emoji Reactions	`E` + `1..9`