$ apt-file list apache2 | more apache2: /usr/share/bug/apache2/control apache2: /usr/share/bug/apache2/script apache2: /usr/share/doc/apache2/NEWS.Debian.gz apache2: /usr/share/doc/apache2/README.Debian.gz apache2: /usr/share/doc/apache2/changelog.Debian.gz ...
7.apt-cache depends: List all Dependent Packages
apt-cache depends + 包， 显示包的所有依赖。在安装包前需要检查安装包所有的依赖
$ apt-cache depends apache2 apache2 |Depends: apache2-mpm-worker |Depends: apache2-mpm-prefork Depends: apache2-mpm-event
8. dpkg -l: Is the Package Already Installed?
dpkg -l , 显示系统中所有的安装包
9. apt-get install: Install a Package
apt-get install + 包，安装包。
10. apt-get remove: Delete a Package
apt-get remove/purge , 删除包
apt-get remove will not delete the configuration files of the package
apt-get purge will delete the configuration files of the package
11. apt-get -u install: Upgrade a Specific Package
apt-get -u install + 包，更新安装包。
12. apt-get -u upgrade: Upgrade all Packages
更新所有安装包。