From KDE UserBase Wiki
  Klipper is your clipboard on steroids

The traditional expectation of a clipboard is that you can copy a section of text in order to paste it elsewhere. If you copy a section, the previous one is lost. Klipper solves this problem at a stroke. The item you copied last will still be the default one to be pasted, but others will have been stored in a buffer, so you can choose to paste your selections in a different order. Even the number of items stored in the buffer can be configured! Click on the icon on your tray or panel, and you will see the possible selections, as well as some options. Let's take a look at some configuration options.


Within Plasma there are two different buffers. One is the clipboard and the other is the selection. The clipboard buffer is filled when you press Ctrl + X or Ctrl + C and pasted by using Ctrl + V. The selection buffer is filled by simply marking some text and pasted by pressing the middle mouse button. Having said that it is important to know that Klipper can be configured to hold both buffers.

  Possibly the two items most important to you on the General tab is whether you want the clipboard to start up empty or to retain its contents across sessions, and whether to synchronise the clipboard contents and selection.
  If you write scripts or work in programming this section is for you. Actions based on regular expressions can be set here.
  Here you can customise existing shortcuts. It is not possible at the moment to make additional ones

The Handbook is available from the Help button at the bottom of the settings dialog.


More Information

Klipper can be accessed from the command line using xclip . To copy to the ctl+C/V buffer use xclip -selection clipboard