What command is used to select all text in a document?

The command used to select all text in a document is 'Ctrl + A'. This shortcut is a widely recognized function across various applications, including word processors, text editors, and other environments that handle text. When this command is executed, it highlights all the text within the active document, allowing users to easily perform further actions such as copying, formatting, or deleting the entire content without needing to manually select each portion of the text.

In contrast, 'Ctrl + S' is used to save the current document, 'Ctrl + C' is the command for copying selected text, and 'Ctrl + X' is used to cut selected text. Each of these commands serves a distinct purpose and doesn't facilitate the selection of all text in the same way that 'Ctrl + A' does. Understanding this command is fundamental for effective text manipulation and enhances productivity in document editing tasks.