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Selection and safe paste

Drag, double-click for a word, triple-click for a line, and Shift to select inside a program that owns the mouse. A paste with a line break shows you what it will run first.

• Select by dragging, a word by double-clicking, a line by triple-clicking. What is highlighted is exactly what copying gives, and a selection stays on its text as output arrives.
• Copy and paste with Ctrl+Shift+C and Ctrl+Shift+V (Cmd+C and Cmd+V on macOS), so plain Ctrl+C is still SIGINT. Ctrl+Insert, Shift+Insert and middle-click work as on any Linux terminal.
• A paste with a line break asks first, showing the text, since at a prompt each line runs the moment it lands. Paste is the default button, and Settings → Terminal → Input turns the question off.
• Pasted text is sanitized. Escape and other control characters are stripped, so a clipboard cannot close a bracketed paste early and run the rest as keystrokes.
• Shift bypasses mouse reporting, the xterm convention, which is how you copy text out of htop. Shift+right-click opens the menu inside such a program.

See Selection and the mouse.