Clipboard
According to Wikipedia:
- The clipboard is a facility used for short-term data storage and/or data transfer between documents or applications, via copy and paste operations.
History
In X10, cut buffers were introduced. These were limited buffers that stored arbitrary text and were used by most applications. However, they were inefficient and implementation of them varied, so selections were introduced. Cut buffers are long deprecated, and although some applications (such as xterm) may have legacy support for them, it is both not likely and not recommended that they be used.
Selections
Freedesktop.org describes the two main selections as follows:
- PRIMARY
- Used for the currently selected text, even if it is not explicitly copied, and for middle-mouse-click pasting. In some cases, pasting is also possible with a keyboard shortcut.
- CLIPBOARD
- Used for explicit copy/paste commands involving keyboard shortcuts or menu items. Hence, it behaves like the single-clipboard system on Windows. Unlike PRIMARY, it can also handle multiple data formats.
The majority of programs for Xorg, including Qt and GTK applications, follow this behavior. While ICCCM also defines a SECONDARY selection, it does not have a consensually agreed upon purpose. Despite the naming, all three selections are basically "clipboards". Rather than the old "cut buffers" system where arbitrary applications could modify data stored in the cut buffers, only one application may control or "own" a selection at one time. This prevents inconsistencies in the operation of the selections.
See the Keyboard shortcuts page which lists the default shortcuts in many programs.
It is also important to realize that according to the selection protocols, nothing is copied until it is pasted. For example, if you select some word in a terminal window, close the terminal and then want to paste it somewhere else, it will not work because the terminal is gone and the text has not been copied anywhere. If you want the word to be preserved after closing terminal window, consider installing a clipboard manager.
Middle-click behavior
The following changes middle-click copy-pasting behavior from PRIMARY, without disabling middle click or altering its other functionalities, like opening in a new tab or scrolling, etc.
Clearing PRIMARY
Run the script
#!/bin/sh
while true; do
xsel -fin </dev/null
done
Application-specific
- GTK — See GTK#Disable mouse paste
- Firefox — See Firefox#Middle-click behavior
- LibreOffice — Can be disabled from Tools > Options > LibreOffice > View > Mouse
Tools
This section lists command-line tools to manipulate the clipboards.
- sselp — Simple X selection printer. Prints the X selection to stdout.
Managers
This section lists clipboard managers which provide additional features such as clipboard history or synchronization.
- Autocutsel — Command line and daemon interfaces to synchronize PRIMARY,
CLIPBOARDand cut buffer selections.
- Clipcat — Clipboard manager written in Rust.
- Klipper — Full featured clipboard manager for the KDE desktop.
- xcmenu — Clipboard synchronizer developed for window manager users.