What is ⌘ Cmd + A keyboard shortcut for?

Popular programs using this shortcut

What this shortcut does in different programs?

1. Xcode - Select All
2. Xcode - Highlight every item in a document or window, or all characters in a text field (equivalent to the Select All command)
3. Google Sheets (Mac) - Select all
4. Apple macOS - Select All items
5. DaVinci Resolve 15 (Mac) - Select all

All programs

All programs using this shortcut, by category.

General

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Apple iBooks - Select all inline objects and text

Apple iBooks - (Select one floating object and press Command + A) Select all floating objects

Apple iBooks - Select all table borders or cell content, depending on the initial selection

Apple macOS - Select All items

elementary OS - Window overivew (across all workspaces)

Roll20 - Select everything on current layer

Waze Map Editor - Select Entire Street - mnemonic Select All

Text editing

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Ace Editor (Mac) - Select all

Adobe Acrobat 2017 (Mac) - Select or deselect all files

TextMate - Select all

Imaging

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Adobe Animate CC (Mac) - Select All

Adobe Dimension CC (Mac) - Select All

Adobe Illustrator (Mac) - Select all

Adobe Lightroom Classic (Mac) - Select all photos

Adobe Premiere Pro (Mac) - Select All

Adobe XD (Mac) - Select All

Apple iMovie - Select all clips.  To select all clips in the timeline, first click anywhere in the timeline. To select all clips in the browser, first click anywhere in the browser

Autodesk SketchBook (Mac) - Select All

Canva (Mac) - Select all

Corel Painter (Mac) - All

DaVinci Resolve 15 (Mac) - Select all

Final Cut Pro X - Select all clips

Final Cut Pro X - Select all clips

Pixelmator Pro - Select the entire image

Xcode - Select All

Xcode - Highlight every item in a document or window, or all characters in a text field (equivalent to the Select All command)

Developer tools

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AWS Cloud9 IDE (Mac) - Select All

Coda for iOS - Select all

CodeMirror - Select all

CoffeeCup Web Editor - Select all

Mode SQL Editor (Mac) - Select All

Mode SQL Editor (Mac) - Select all

RStudio (Mac) - Select All

Media player

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iTunes 11 for Mac - Select all the songs in the list

Games

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Total War: Attila (Mac) - Select all

Productivity

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Ableton Live 10 (Mac) - Select All

Ableton Live 10 (Mac) - Select all Clips/Slots

Apple GarageBand - Select all

Apple Pages - Select all objects and text

Apple Pages - Select all objects

Apple Pages - (after selecting a cell) Select all content in a table

Final Draft 11 (Mac) - Select all

Google Sheets (Mac) - Select all

iPad Smart Keyboard - Select all text

Melodyne 4 (Mac) - Select all

Tableau (Mac) - Select all data

Things (iPad) - Select everything

Things (Mac) - Select everything

Scientific

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GeoGebra - Select All