Finding packages
Say, for example, you just heard about this really cool program, and you are
pretty certain that it is provided in the Debian distribution, but a man or
info attempt fails to provide any information. When you ask dpkg about the
package, it says it isn't installed! So now what do you do?
Debian provides two files in its archives which are useful for this purpose:
Packages, and Contents. The Packages file is usually located in the binary
part of the archives, while the Contents file is usually in the outer directory of
the main portion of the distribution. If you know the name of the package, then
you can use grep to print its entry in the Packages file. However if you only
know the name of a program that you are interested in, like fuser mentioned
above, then the command:
grep fuser Contents
executed in the directory containing the Contents file, will tell us that
/bin/fuser is found in the package base/psmisc, in other words the psmisc
package is located in the section base, so it is most likely already installed on
the system (base packages are installed first). Checking with dpkg  s psmisc
will indicate the status of the package, and provide information about the
maintainer as well as a description of the package. If the package is not in 
stalled then the information from dpkg will be quite useless, as it can only
tell you that the package is not installed. Once you know the package name,
the Packages file can be grepped for the necessary information. So, look for
programs in the Contents file, and their packages in the Packages file.
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