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Distinction between apt-cache and dpkg -l


BOTH available-old & available missing from dpkg - “dpkg: error: failed to open package info file `/var/lib/dpkg/available' for reading”successful installing packages but dpkg has errorproblem running apt-get and dpkg command in ubuntu14How to do an offline installation of packages in ubuntu 12.04 by exporting this folder /var/cache/apt/*Difference between apt search and apt-cache searchdpkg and 50unattended-upgrades.ucftmp issuedoes apt-get checks cache directory before downloading packagesproblem with apt and dbkg18.04.1 Server keeps creating /var/lib/dpkg/lock and /var/cache/apt/archives/lock. What now?apt-get Not Working (Again)













3















I use apt-cache pkgname to retrieve the packages as 



me@host:~$ apt-cache pkgnames | wc -l
62803


get 62803 results



but 



me@host:~$ dpkg -l | wc -l
2336


What's the reasons which lead such a huge distinction. I presume that dpkg is super than apt.






apt package-management dpkg







share|improve this question




























    3















    I use apt-cache pkgname to retrieve the packages as 



    me@host:~$ apt-cache pkgnames | wc -l
    62803


    get 62803 results



    but 



    me@host:~$ dpkg -l | wc -l
    2336


    What's the reasons which lead such a huge distinction. I presume that dpkg is super than apt.






    apt package-management dpkg







    share|improve this question


























      3












      3








      3


      1






      I use apt-cache pkgname to retrieve the packages as 



      me@host:~$ apt-cache pkgnames | wc -l
      62803


      get 62803 results



      but 



      me@host:~$ dpkg -l | wc -l
      2336


      What's the reasons which lead such a huge distinction. I presume that dpkg is super than apt.






      apt package-management dpkg







      share|improve this question
















      I use apt-cache pkgname to retrieve the packages as 



      me@host:~$ apt-cache pkgnames | wc -l
      62803


      get 62803 results



      but 



      me@host:~$ dpkg -l | wc -l
      2336


      What's the reasons which lead such a huge distinction. I presume that dpkg is super than apt.






      apt package-management dpkg




      apt package-management dpkg






      share|improve this question















      share|improve this question













      share|improve this question




      share|improve this question








      edited 59 mins ago









      Sergiy Kolodyazhnyy

      74k9154323




      74k9154323










      asked 3 hours ago









      AliceAlice

      450110




      450110




















          1 Answer
          1






          active

          oldest

          votes


















          3














          apt is for managing remote repositories, dpkg - for locally installed packages. They're related. apt is front end to dpkg. When you run apt-get install package it gets .deb file, and installs it via dpkg. So numbers differ because there's a lot of packages available, but only fraction is installed locally on your system.



          apt-cache can show both installed and non-installed packages, because it queries the apt cache - listing of what is available in remote repositories ( that cache is what you get when you do apt-get update). For instance,



          $ apt-cache policy terminator
          terminator:
           Installed: (none)
           Candidate: 1.91-1


          $ dpkg -l terminator
          dpkg-query: no packages found matching terminator





          share|improve this answer
























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            1 Answer
            1






            active

            oldest

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            active

            oldest

            votes






            active

            oldest

            votes









            3














            apt is for managing remote repositories, dpkg - for locally installed packages. They're related. apt is front end to dpkg. When you run apt-get install package it gets .deb file, and installs it via dpkg. So numbers differ because there's a lot of packages available, but only fraction is installed locally on your system.



            apt-cache can show both installed and non-installed packages, because it queries the apt cache - listing of what is available in remote repositories ( that cache is what you get when you do apt-get update). For instance,



            $ apt-cache policy terminator
            terminator:
             Installed: (none)
             Candidate: 1.91-1


            $ dpkg -l terminator
            dpkg-query: no packages found matching terminator





            share|improve this answer





























              3














              apt is for managing remote repositories, dpkg - for locally installed packages. They're related. apt is front end to dpkg. When you run apt-get install package it gets .deb file, and installs it via dpkg. So numbers differ because there's a lot of packages available, but only fraction is installed locally on your system.



              apt-cache can show both installed and non-installed packages, because it queries the apt cache - listing of what is available in remote repositories ( that cache is what you get when you do apt-get update). For instance,



              $ apt-cache policy terminator
              terminator:
               Installed: (none)
               Candidate: 1.91-1


              $ dpkg -l terminator
              dpkg-query: no packages found matching terminator





              share|improve this answer



























                3












                3








                3







                apt is for managing remote repositories, dpkg - for locally installed packages. They're related. apt is front end to dpkg. When you run apt-get install package it gets .deb file, and installs it via dpkg. So numbers differ because there's a lot of packages available, but only fraction is installed locally on your system.



                apt-cache can show both installed and non-installed packages, because it queries the apt cache - listing of what is available in remote repositories ( that cache is what you get when you do apt-get update). For instance,



                $ apt-cache policy terminator
                terminator:
                 Installed: (none)
                 Candidate: 1.91-1


                $ dpkg -l terminator
                dpkg-query: no packages found matching terminator





                share|improve this answer















                apt is for managing remote repositories, dpkg - for locally installed packages. They're related. apt is front end to dpkg. When you run apt-get install package it gets .deb file, and installs it via dpkg. So numbers differ because there's a lot of packages available, but only fraction is installed locally on your system.



                apt-cache can show both installed and non-installed packages, because it queries the apt cache - listing of what is available in remote repositories ( that cache is what you get when you do apt-get update). For instance,



                $ apt-cache policy terminator
                terminator:
                 Installed: (none)
                 Candidate: 1.91-1


                $ dpkg -l terminator
                dpkg-query: no packages found matching terminator






                share|improve this answer














                share|improve this answer



                share|improve this answer








                edited 3 hours ago

























                answered 3 hours ago









                Sergiy KolodyazhnyySergiy Kolodyazhnyy

                74k9154323




                74k9154323



























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