Use of the Ubuntu apt-get apt-cache command

The apt-get command does not provide the software package management function, but provides a command line platform for software package management.

Use more sub-commands on this platform to complete specific management tasks.

The general syntax format of the apt-get command is:

 

Sh code

Apt-get subcommands [-d |-f |-m |-q | -- purge | -- reinstall |-B |-s |-y |-u |-h |-v] [pkg]

Apt-cache provides the search function.

1. Update or upgrade operations:

 

Sh code

Apt-get update # update source

Apt-get upgrade # update all installed packages

Apt-get dist-upgrade # Release Version upgrade (for example, from 10.10 to 11.04)

2. Installation or reinstallation:

 

Sh code

Apt-get install pkg # install the pkg package. Separate multiple packages with spaces.

Apt-get install -- reinstall pkg # reinstall the software package pkg

Apt-get install-f pkg # Fix installation (broken dependency) package pkg

3. unmount operations:

 

Sh code

Apt-get remove pkg # Delete the software package pkg (excluding the configuration file)

Apt-get purge pkg # Delete the package pkg (including the configuration file)

4. Download and clear operations:

 

Sh code

Apt-get source pkg # download the source code of the pkg package to the current directory

Apt-get download pkg # download the Binary Package of the pkg package to the current directory

Apt-get source-d pkg # After downloading the source code package, compile

Apt-get build-dep pkg # build the dependent environment of the pkg source code package (compiling environment ?)

Apt-get clean # Clear all downloaded packages in the cache (under/var/cache/apt/archives/{, partial })

Apt-get autoclean # similar to clean, but it clears expired packages in the cache (that is, packages that cannot be downloaded or are useless)

Apt-get autoremove # Delete dependency packages that are not needed because the software is automatically installed

5. query operations:

 

Sh code

Apt-cache stats # displays statistics of system software packages

Apt-cache search pkg # Use the keyword pkg to search for software packages

Apt-cache show pkg_name # displays the details of the pkg_name package.

Apt-cache depends pkg # view the software package on which pkg depends

Apt-cache rdepends pkg # Check that pkg is dependent on those software packages

6. Description of the software installation directory:

 

The general deb package (including new or apt-get download) is in/usr/share.

Some of the compressed or compiled packages can be installed in/usr/local/or/opt.

 

7. cache directory for apt-get:

The default cache directory is/var/cache/apt/archives/

To save the download time or use the software package after installing the software after the system is reinstalled in the future, you can compress and back up the software package in the directory and clean it up to save space.