Suppose you type the following command and press “Enter.” ls -R / We can easily see the functions that have been allocated to Ctrl+C and Ctrl+V. The Bash shell is a program running in that emulated TTY. Note that it is the terminal window that is the emulation. Because a terminal window is an emulated TTY, that keystroke combination (and many others) have been preserved and replicated in the emulation. That signal is SIGINT, which tells the current process to terminate. When a TTY was a physical device, Ctrl+C was chosen as a handy key combination to generate a signal. In fact, those keystrokes were recruited a long time before graphical shells were invented, back when a teletype (TTY) was a physical thing. Ctrl+C and Ctrl+V were allocated functions long before copying and pasting were ever thought of. Once our newcomer opens a terminal window and tries to copy and paste at the Bash shell command prompt, that all changes. They use the keystrokes from muscle memory and get on with their work.
Ctrl+C copies highlighted text and Ctrl+V pastes it at the cursor. Our newcomer to Linux probably doesn’t even think about the fact that these conventions have been carried through to these applications. Those very same keystrokes work in most Linux graphical applications, such as the editor gedit or the LibreOffice office suite.
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