debian package management system

debian-package-management

dpkg
dpkg-reconfigure

APT
--apt-get , apt-cache
--configuration
aptitute

dpkg is the program is used to installing debian pacakages
dpkg -l firefox to see if firefox installed and the information about the firefox
dpkg -p firefox to see other documentattion on the machine
dpkg -i install debian package
dpkg -r [name of the package]    --- removes the package installed

dpkg flags
-i        --install           --  install the package  
-l        --list              --  lists all the pacakges
-L        --list files        --  show all install files
-P        --purge             --  will remove the program and the config files
-p        --print available   --  gives details  
-r        --remove            --  will remove the program only not the config files
-S        --search            --  shows what pacakge it from or displays package supplying file


dpkg-reconfigure
    --  very handy
    --  you need to know the package name
    
    dpkg-reconfigure
    
  apt pacakge management system
  
  --  dist-upgrade        --  upgrades the version
  --  update              --  normal system update
  --  install             --  install pacakges
  --  remove              --  removes the packages
  
  
  apt-cache commands
  
  --  search            --     search keywork
  --  show              --      shows the information about the file
  --  depends           --      shows the dependencies
  --  rdepends          --      reverse dependencies -- shows which other packages depends on it
  
  
  aptitude is same as the apt and have same commands
  
  --  search            --     search keywork
  --  show              --      shows the information about the file
  --  depends           --      shows the dependencies
  --  rdepends          --      reverse dependencies -- shows which other packages depends on it
  
  you can use aptitude with no parameters to launch graphical tool which can help you to manage pakages graphically
  
  
  Configuration
  
  /etc/apt/sources.list       === files contains the list of repositories information were os can update the app                                    cache and install softwares with apt-get commands