Программное копирование в буфер обмена

как в gtk2 незнаю, а в Х можно поковырять пару пакетов(маленьких)
и найти в них нужную инфу:

apt-cache show xsel
Package: xsel
Priority: optional
Section: x11
Installed-Size: 60
Maintainer: Thom May <thom@debian.org>
Architecture: i386
Version: 0.9.6-1
Depends: libc6 (>= 2.2.4-4), xlibs (>> 4.1.0)
Filename: pool/main/x/xsel/xsel_0.9.6-1_i386.deb
Size: 17404
MD5sum: 6fceb202729ee20b1fb5d774edefbea7
Description: More than just cat for the X selection.
XSel is a command-line program for getting and setting the contents of
the X selection. Normally this is only accessible by manually highlighting
information and pasting it with the middle mouse button.

apt-cache show xwit
Package: xwit
Priority: optional
Section: x11
Installed-Size: 76
Maintainer: Dima Barsky <dima@debian.org>
Architecture: i386
Version: 3.4-6
Depends: libc6 (>= 2.3.1-1), xlibs (>> 4.1.0)
Filename: pool/main/x/xwit/xwit_3.4-6_i386.deb
Size: 14852
MD5sum: 18a43af4ff0d72dedd2e10fb220d5698
Description: a collection of simple routines to call some X11 functions
xwit is a collection of simple routines to call some X11 functions
that don't already have any utility commands built around them.
The reasoning behind this is that loosely every X function should be
accessible from a shell script.
.
For example, XWarpPointer() will move the X pointer, but no utility
program exists to do so on those rare occasions when you could really
use it. xwit will also resize, iconify, pop, and move windows given
by name or id, change an icon, title or name, set the screen saver
going, and change individual key autorepeat settings, etc.