如何在Linux上检查一个软件包的详细信息

（LCTT 译注：用管理员权限查询 apache2 包的信息）

$ sudo apt-cache show apache2
Package: apache2
Priority: optional
Section: web
Installed-Size: 473
Maintainer: Ubuntu Developers 
Original-Maintainer: Debian Apache Maintainers 
Architecture: amd64
Version: 2.4.12-2ubuntu2
Replaces: apache2.2-common
Provides: httpd, httpd-cgi
Depends: lsb-base, procps, perl, mime-support, apache2-bin (= 2.4.12-2ubuntu2), apache2-utils (>= 2.4), apache2-data (= 2.4.12-2ubuntu2)
Pre-Depends: dpkg (>= 1.17.14)
Recommends: ssl-cert
Suggests: www-browser, apache2-doc, apache2-suexec-pristine | apache2-suexec-custom, ufw
Conflicts: apache2.2-common (<< 2.3~)
Filename: pool/main/a/apache2/apache2_2.4.12-2ubuntu2_amd64.deb
Size: 91348
MD5sum: ab0ee0b0d1c6b3d19bd87aa2a9537125
SHA1: 350c9a1a954906088ed032aebb77de3d5bb24004
SHA256: 03f515f7ebc3b67b050b06e82ebca34b5e83e34a528868498fce020bf1dbbe34
Description-en: Apache HTTP Server
 The Apache HTTP Server Project's goal is to build a secure, efficient and
 extensible HTTP server as standards-compliant open source software. The
 result has long been the number one web server on the Internet.
 .
 Installing this package results in a full installation, including the
 configuration files, init scripts and support scripts.
Description-md5: d02426bc360345e5acd45367716dc35c
Homepage: http://httpd.apache.org/
Bugs: https://bugs.launchpad.net/ubuntu/+filebug
Origin: Ubuntu
Supported: 9m
Task: lamp-server, mythbuntu-frontend, mythbuntu-desktop, mythbuntu-backend-slave, mythbuntu-backend-master, mythbuntu-backend-master

APT 命令：查看 Debian/Ubuntu/Mint 系统上的包信息

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