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apt-cache

Get information on packages without downloading them.

See also: apt-rdepends.

List package dependencies

apt-cache depends $PKG

The pattern is a POSIX ERE.

Get detailed information about a package:

apt-cache showpkg $PKG

sudo aptitude install debtags
debtags tag ls $PKG

show

Get basic information about a package that can be installed from the remote server:

apt-cache show hello

Sample output:

Package: hello
Priority: optional
Section: devel
Installed-Size: 108
Maintainer: Ubuntu Developers <ubuntu-devel-discuss@lists.ubuntu.com>
Original-Maintainer: Santiago Vila <sanvila@debian.org>
Architecture: amd64
Version: 2.8-4
Depends: libc6 (>= 2.14), dpkg (>= 1.15.4) | install-info
Filename: pool/main/h/hello/hello_2.8-4_amd64.deb
Size: 28148
MD5sum: af651f8b526976269affa5b888e63db7
SHA1: c353f6e99dad0dc628b5604741bfbf97eaf74bcf
SHA256: 0cd79de61001c8f6ab7611ba724f0f7da7fd0998bf0fd98710fe26d81f0a6b18
Description-en: The classic greeting, and a good example
 The GNU hello program produces a familiar, friendly greeting.  It
 allows non-programmers to use a classic computer science tool which
 would otherwise be unavailable to them.
 .
 Seriously, though: this is an example of how to do a Debian package.
 It is the Debian version of the GNU Project's `hello world' program
 (which is itself an example for the GNU Project).
Description-md5: b7df6fe7ffb325083a3a60819a7df548
Homepage: http://www.gnu.org/software/hello/
Bugs: https://bugs.launchpad.net/ubuntu/+filebug
Origin: Ubuntu
Supported: 5y

May show multiple versions if may are available.

showsrc

apt-cache showsrc

List all direct build dependencies: http://askubuntu.com/questions/21379/how-do-i-find-the-build-dependencies-of-a-package

apt-cache showsrc $PKG | grep -i build

policy

apt-cache policy hello

Sample output:

hello:
  Installed: 2.8-4
  Candidate: 2.8-4
  Version table:
 *** 2.8-4 0
        500 http://fr.archive.ubuntu.com/ubuntu/ trusty/main amd64 Packages
        500 http://archive.ubuntu.com/ubuntu/ trusty/main amd64 Packages
        100 /var/lib/dpkg/status

Meaning:

Example with multiple available versions:

gdb:
  Installed: 7.7.1-0ubuntu5~14.04.2
  Candidate: 7.7.1-0ubuntu5~14.04.2
  Version table:
 *** 7.7.1-0ubuntu5~14.04.2 0
        500 http://fr.archive.ubuntu.com/ubuntu/ trusty-updates/main amd64 Packages
        100 /var/lib/dpkg/status
     7.7-0ubuntu3 0
        500 http://fr.archive.ubuntu.com/ubuntu/ trusty/main amd64 Packages
        500 http://archive.ubuntu.com/ubuntu/ trusty/main amd64 Packages