However, if a
program you still have on the system needs those files, you want to be
sure you keep them.
Finally, you'd like to be able to upgrade a program. When you upgrade, you
want to delete obsolete files and add new ones, without breaking any part
of the system.
The Debian package system solves these problems. It allows you to install,
remove, and upgrade software packages, which are neat little bundles
containing the program files and information that helps the computer
manage them properly. Debian packages have filenames ending in the
extension .deb, and they're available on the FTP site or on your official
Debian CD-ROM.
dpkg
The simplest way to install a single package you've downloaded is with the
command dpkg -i (short for dpkg -install). Say you've downloaded the
package icewm_0.8.12-1.deb and you'd like to install it. First log on as
root, and then type dpkg -i icewm_0.8.12-1.deb, and icewm version 0.8.12
will be installed. If you already had an older version, dpkg will upgrade
it rather than installing both versions at once.
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