How to use apt-cache under Ubuntu Linux

apt-cache performs a variety of operations on APT's package cache.  apt-cache does not manipulate the state of the system but does provide operations to search and generate interesting output from the package meta data.

showpkg displays information about the packages listed on the command line

apt-cache showpkg firefox

Stats displays some statistics about the cache

apt-cache stats

Dump shows a short listing of every package in the cache. It is primarily for debugging.

apt-cache dump firefox

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