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The dpkg and apt-get commands are pretty useful and provide a lot of functionality. Here's some common things that you may want to do:
Search for the package that installed the file diff.info.gz
$ dpkg --search diff.info.gz [alternative is -S]
List all packages installed (one line per package)
$ dpkg --list [alternative is -l] $ dpkg --get-selections
What is the (one-line) status of the diff package?
$ dpkg --list diff
List the information for any package with diff in its name
$ dpkg --list *diff*
List files associated with the package diff
$ dpkg --listfiles diff [alternative dpkg -L diff]
What packages mention diff?
$ apt-cache search diff
Display information about a package
$ apt-cache show diff [alternative is dpkg --print-avail]
What packages depend on diff?
$ apt-cache showpkg diff $ apt-cache depends diff
