What is Ctrl + U keyboard shortcut for?

Arch Linux - Cut everything from line start to cursor  

Ardour - All enclosed by edit range  

Audacity - Mute All Tracks  

Brave (Windows) - Display non-editable HTML source code for the current page  

E-Sword - Underline Editors only  

Feedreader - Refresh article list  

Firefox - Page source  

GoldWave - AutoTrims the sound.  Removes silences within the ends of the selection.  

Google Chrome - Display non-editable HTML source code for the current page  

Microsoft Edge (Chromium) - View source  

Microsoft Edge (legacy) - View source  

Microsoft Photos App - Remove selected items from album  

Mozilla Thunderbird - View message source  

Opera - Clear all  

Opera - Toggle text-style underline  

Opera - Go to previous unread message  

Quicken 2018 - Go to the Portfolio  

Red Hat Enterprise Linux - Clear the current line in terminal  

Roll20 - Add selected object(s) to turn tracker  

Ubuntu - Underline the selected text  

uTorrent - Add new torrent from URL  

Vivaldi - View page source  

Ace Editor - Change to upper case  

Brackets - Undo selection  

Brackets - To Upper Case  

Brackets - Undo last selection change  

CherryTree 0.38.8 - Toggle Underline Property of the Selected Text  

CudaText 1.88.3 - Toggle word-wrap mode (off / window / margin)  

Dropbox Paper - Underline  

FocusWriter - Underline  

gedit - Convert the selected text to upper case  

KompoZer - Text style Underline  

Metapad - Transparent mode  

Microsoft FrontPage - Apply an underline.  

Microsoft OneNote - Apply underline to or remove it from the selected text  

Microsoft Word 2019 - Apply an underline  

Most used text editing - Underline  

Nano - Uncut from the cut buffer into the current line  

Notepad2 - Make lowercase  

Nuance Power PDF - Display / hide gridlines  

OneNote for the web - Underline  

Overleaf - Change selected text to upper case  

Overleaf - Change selected text to upper case  

PDF-XChange Editor - Underline  

Scrivener 1.9.9 - Underlined  

Sublime Text - Soft undo; jumps to your last change before undoing change when repeated  

Texmaker 5.0.4 - Uncomment  

TextRoom - Underline  

TiddlyWiki - Apply underline formatting to selection  

Tomboy 0.23 - Underline  

Typora 0.9.81 - Underline  

Wordpad - Underline selected text  

Workflowy - Underline  

WriteMonkey - Soft undo  

Zathura 0.4.5 - Scroll a half page left, down, up or right  

ZenWriter 2 - Underline  

Zim - Make selected text underline (renders highlighted)  

Adobe Animate CC (Windows) - Ungroup  

Adobe Illustrator - Show/ hide smart guides  

Adobe Lightroom Classic - Auto tone  

Adobe Premiere Pro (Windows) - Underline  

Affinity Photo - Underline  

Affinity Photo - HSL (Adjustment)  

Blender - Save User Settings  

Clip Studio Paint Pro - Tonal correction: Hue/Saturation/Luminosity  

Corel Painter - Ungroup  

Corel Painter - Ungroup  

CorelDRAW Graphics Suite 2018 - Ungroup  

Enterprise Architect 14 - Locate diagrams in which the element is used.  

Global Mapper 21 - UNLOAD All Loaded Data Files  

Harmony 20 - Preferences  

Inkscape - Ungroup selected group(s)  

Inkscape - toggle Unicode entry  

IrfanView - Custom rotation dialog  

Krita 3.0 - HSV/HSL adjust  

Krita 4.2.2 - HSV Adjustment…  

Krita 4.2.2 - Underline  

LDView - Right side up  

LightWave 3D - Unweld polygons  

LightWave 3D - UnParent bone  

Microsoft Paint - Underline selected text  

Nuke - Enable or disable previewing output on an external broadcast video monitor  

Pinnacle Studio 22 - Toggle underline  

PowerDirector 17 - Adjust system volume  

Siemens NX - Execute > NX Open  

Simplify3D - Customize support structures  

Bash (Unix shell) - Cut the part of the line before the cursor and add it to the clipboard  

Cisco IOS - Delete all characters from the cursor to the beginning of the command line  

Everything - Toggle match path  

SyncBack - Unselect all  

Android Studio - Go to super-method/super-class  

Atom (Windows) - This undoes the previous selection, like from Select Same Words  

Atom (Windows) - (Source: Find And Replace) find-and-replace:select-undo  

AWS Cloud9 IDE (Windows) - Open Tree Panel  

AWS Cloud9 IDE (Windows) - To Uppercase  

Chrome DevTools - Select / de-select the next occurrence of whatever word the cursor is on. Each occurrence is highlighted simultaneously  

CodeMirror - Undo the last change to the selection, or if there are no selection-only changes at the top of the history, undo the last change  

CoffeeCup HTML Editor - Underline  

FBIde - Make selected text uppercase  

FileMaker - Preview mode  

FileMaker - Select tables with the same source table  

Git Tower (Windows) - Push HEAD  

HeidiSQL - Uppercase block  

IDA Pro 7.4 - Next unexplored  

IntelliJ IDEA (Windows, Linux) - Go to super-method/ super-class  

IPython Shell - Cut text from beginning of line to cursor  

jEdit - Select to marker with shortcut key.  

JetBrains WebStorm - Go to super-method/super-class  

Komodo Edit - Make uppercase  

Looker 6.8 (Windows) - Share  

Looker 6.8 (Windows) - Share  

Microsoft Visual Studio 2017 (All shortcuts) - Format.Underline  

Microsoft Visual Studio 2017 (All shortcuts) - Edit.MakeLowercase  

Microsoft Visual Studio 2017 (All shortcuts) - Image.UseSelectionasBrush  

Mode SQL Editor (Mac) - Change to upper case  

Mode SQL Editor (Windows) - Change to upper case  

Mode SQL Editor (Windows) - Underline  

Notepad++ - Convert to lower case  

PyCharm 2018.2 - Navigate to a super method declaration of a method under the caret.  

PythonWin - Convert the selection to lower case  

Qt Creator - Select the current block (The second press extends the selection to the parent block. To enable this behavior, select Tools> Options > Text Editor > Behavior > Enable smart selection changing)  

Roblox Studio - Ungroup  

RStudio - Yank line up to cursor  

RStudio (Mac) - Yank line up to cursor  

S3 Browser 8.6.7 - Generate web URLs  

S3 Browser 8.6.7 - Upload files  

SQL Server Management Studio (SSMS) - Make the selected text lower case  

SQLyog - Add A New User  

Valentina Studio - Make Selection Lower  

Visual Studio Code (Linux) - Undo last cursor operation  

Visual Studio Code (Windows) - Undo last cursor operation  

Chromebook and Chrome OS - View page source  

Facebook (Chrome) - Go to other messages  

FastMail - Underline  

Gmail - Underline  

Google Data Studio - Underline  

Joomla - Toggles underlining of selected text  

TinyMCE - Underline  

WordPress - Underline  

Yahoo Mail - Underline  

FileZilla - Preserve timestamps of transferred files  

Midnight Commander (macOS) - Swap panels  

Mp3tag - Unselect all  

PuTTY - Clear the line before the cursor position. If you are at the end of the line, clears the entire line  

Total Commander - Swap left and right view  

WhereIsIt? - View user list  

WinSCP - Keep remote directory up to date  

AIMP - Add URL  

Audacious 4.0.4 (Windows) - Queue manager  

foobar2000 - Add location  

GOM Player - Open URL  

iTunes 11 for Windows - Stream audio file at a specific URL to iTunes  

KMPlayer - Open URL  

PotPlayer 1.7 - Open URL  

Rhythmbox - Enable / Disable Shuffle play  

SMPlayer 19.5.0 - Open URL  

Tidal - Check for updates  

Windows Media Player 11 - Specify either a URL or path of a file  

Assetto Corsa - Cycle virtual desktops  

Black Desert Online - Toggle Free Cam  

Black Desert Online - Screenshot mode  

FlightGear - Add 1000 ft. to your altitude (emergency)  

LSPDFR - Stop traffic  

PlayerUnknown's Battlegrounds - Toggle UI  

Ring of Elysium - Turn the microphone off  

Adobe Connect - Underline text  

Cisco Jabber - Underlined  

Claws Mail - Show message source  

Claws Mail - Delete line  

Discord - Toggle channel member list  

eM Client - Underline selected text  

Google Hangouts - Underline  

HexChat 2.14.2 - Insert in buffer  

mIRC - Underlined  

NewsBin Pro - Unlock poster  

Pidgin - Plugins  

Slack - Upload a file  

Zimbra Web Client - Underlined  

Comodo IceDragon - Page Source  

KeePass - Underline  

KeeWeb 1.12.3 - Copy website  

Ableton Live 10 - Quantize  

Ableton Live 10 - Quantize  

ActivePresenter 7 - Underline  

ActivePresenter 7 - Underline  

Adobe Captivate 2019 - Underline the selected text  

Articulate Storyline - Underline selected text  

CintaNotes 3.13 - Display untagged notes.  

CintaNotes 3.13 - Toggle various formatting on currently selected text.  

coda.io (Windows, Mac) - Underline  

Confluence - Underline  

draw.io - Toggle underline on selected text  

Edius Pro 9 - Change Time Scale (Undo)  

Epic - Toggle underline  

Evernote for Windows - Underline  

Excel for the web - Underline  

Figma - Underline  

FL Studio 20 - Quick Chop  

Front (macOS) - Underline  

Google Sheets - Underline  

Google Sheets (Android) - Underline  

Guitar Pro - Brush upstroke  

Lacerte - E-file Wizard  

Lacerte - Underline selected text  

LibreOffice - The Underlined attribute is applied to the selected area. If the cursor is positioned in a word, this word is also underlined  

LibreOffice - Refreshes the selected theme  

Lucidchart - Underline  

Mailchimp - Underline selected text  

Microsoft Excel 2019 - Underline text or remove underline  

Microsoft Excel 2019 - Applies or removes underlining  

Microsoft PowerPoint 2019 (Creating presentations) - Apply an underline  

Microsoft PowerPoint 2019 (Slideshows) - Hide the pointer and navigation button in 15 seconds  

Microsoft Sticky Notes - Underlined  

Miro - Underline  

Nimbus Note - Underline  

Notezilla - Underline  

Nuendo 10 - Ungroup  

Oracle EBS Forms - Update record  

Outlook 2019 and Outlook 2016 - Mark as unread  

Outlook 2019 and Outlook 2016 - Underline  

QuickBooks Desktop - Use the item from the list that you have just opened using Ctrl + L.  

Quip - Underline the selected text  

SharePoint - Apply or remove the underline from the selected text.  

SimpleMind - Toggle Underline font effect for selected topics or labels  

The Bat! - Mark as unread  

The Bat! - Underline  

Tracktion T7 DAW (Windows) - Punch out of automation record mode, clearing any subsequent curve data  

WPS Office - Applies or removes underlining  

Catia V5 - Update  

KiCad 5.0.2 - Switch Units  

Maple - Underline (text or Maple input)  

Maple - Undo Changes to the Line  

Onshape 1.98 - Feedback / Report a bug  

OpenSCAD 2019.05 - Lowercase selection  

Originlab Origin 2020 - Open the Options dialog.  

Originlab Origin 2020 - Toggle Underline on & off  

Originlab Origin 2020 (Mac keyboard) - Open the Options dialog.  

Originlab Origin 2020 (Mac keyboard) - Toggle Underline on & off  

Tekla Structures 20 - Update  

BlackBerry Classic - Underline