ubuntu-查看某个软件包的信息

以查看java-jdk软件信息为例

deepfuture@server-deepfuture1:~$ apt-cache show sun-java6-jdk
Package: sun-java6-jdk
Priority: optional
Section: multiverse/devel
Installed-Size: 56796
Maintainer: Matthias Klose <[e-mail]>
Architecture: amd64
Source: sun-java6
Version: 6-14-0ubuntu1.9.04
Provides: java-compiler, java-sdk, java2-compiler, java2-sdk, java5-sdk, java6-sdk
Depends: sun-java6-bin (= 6-14-0ubuntu1.9.04), libc6, libx11-6
Pre-Depends: debconf (>= 0.5) | debconf-2.0
Suggests: sun-java6-demo, sun-java6-doc, sun-java6-source
Filename: pool/multiverse/s/sun-java6/sun-java6-jdk_6-14-0ubuntu1.9.04_amd64.deb
Size: 18691234
MD5sum: bde5d4a46c1578b40be442765bc6461c
SHA1: cdb7157fb46f00defdc7f84f6ce89e0c50922ae5
SHA256: 43f391c73875e213dba7f49c4f7b2b76c5282a437caacb5d154524d54d1daa5c
Description: Sun Java(TM) Development Kit (JDK) 6
 The JDK(TM) is a development environment for building applications,
 applets, and components using the Java programming language.
 .
 The JDK includes tools useful for developing and testing programs
 written in the Java programming language and running on the Java
 Platform.
 .
 NOTE: You must accept Sun's EULA prior to successfully installing
 this package
Homepage: http://java.sun.com/javase/
Bugs: https://bugs.launchpad.net/ubuntu/+filebug
Origin: Ubuntu

Package: sun-java6-jdk
Priority: optional
Section: multiverse/devel
Installed-Size: 54916
Maintainer: Matthias Klose <[e-mail]>
Architecture: amd64
Source: sun-java6
Version: 6-13-1
Provides: java-compiler, java-sdk, java2-compiler, java2-sdk, java5-sdk, java6-sdk
Depends: sun-java6-bin (= 6-13-1), libc6, libx11-6
Pre-Depends: debconf (>= 0.5) | debconf-2.0
Suggests: sun-java6-demo, sun-java6-doc, sun-java6-source
Filename: pool/multiverse/s/sun-java6/sun-java6-jdk_6-13-1_amd64.deb
Size: 17684750
MD5sum: d2db1008a03c7cde6a3b2f3cf2beaa53
SHA1: cdd72ddb6116255b7de35df1189b17eac07f346a
SHA256: 037561ca3e16e6885bb4dea9e1bfc739c46e586b325938600fcf46e5dd45e49a
Description: Sun Java(TM) Development Kit (JDK) 6
 The JDK(TM) is a development environment for building applications,
 applets, and components using the Java programming language.
 .
 The JDK includes tools useful for developing and testing programs
 written in the Java programming language and running on the Java
 Platform.
 .
 NOTE: You must accept Sun's EULA prior to successfully installing
 this package
Homepage: http://java.sun.com/javase/
Bugs: https://bugs.launchpad.net/ubuntu/+filebug
Origin: Ubuntu