Listando pacotes instalados                        

# dpkg --list

Desired=Unknown/Install/Remove/Purge/Hold
| Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend
|/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad)
||/ Name                                Version                      Description
+++-==================================================================
ii  acpi                               1.5-2                           displays information on ACPI devices
ii  acpi-support-base           0.137-5                        scripts for handling base ACPI events such as the power buttonacpid                        1:2.0.7-1squeeze4       Advanced Configuration and Power Interface event daemonii  adduser              3.112+nmu2                add and remove users and groups
ii  amavisd-new                  1:2.6.4-3                    Interface between MTA and virus scanner/content filters
ii  apache2                         2.2.16-6+squeeze10    Apache HTTP Server metapackage
ii  apache2-mpm-prefork     2.2.16-6+squeeze10    Apache HTTP Server - traditional non-threaded modeli  apache2-utils          2.2.16-6+squeeze10           utility programs for webservers
ii  apache2.2-bin                 2.2.16-6+squeeze10    Apache HTTP Server common binary files
ii  apache2.2-common         2.2.16-6+squeeze10    Apache HTTP Server common files
ii  apt                                 0.8.10.3+squeeze1      Advanced front-end for dpkg
ii  apt-listchanges                2.85.7+squeeze1         package change history notification tool
ii  apt-show-versions           0.16                            lists available package versions with distribution
ii  apt-utils                          0.8.10.3+squeeze1      APT utility programs
ii  aptitude                          0.6.3-3.2+squeeze1     terminal-based package manager (terminal interface only)c  arpwatch                 2.1a15-1.1+squeeze1   Ethernet/FDDI station activity monitor
ii  aspell                              0.60.6-4                     GNU Aspell spell-checker

:
:



#  dpkg --list | grep -i 'http'

ii  apache2                        2.2.16-6+squeeze10   Apache HTTP Server metapackage
ii  apache2-mpm-prefork      2.2.16-6+squeeze10   Apache HTTP Server - traditional non-
ii  apache2.2-bin                2.2.16-6+squeeze10   Apache HTTP Server common binary files
ii  apache2.2-common         2.2.16-6+squeeze10   Apache HTTP Server common files
ii  libwww-perl                   5.836-1                    Perl HTTP/WWW client/server library
ii  squid3                          3.1.6-1.2+squeeze2    A full featured Web Proxy cache (HTTP proxy)
ii  squid3-common              3.1.6-1.2+squeeze2    A full featured Web Proxy cache (HTTP proxy) 

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