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apt-get

The apt-get command is a powerful package management tool used in Debian-based Linux distributions, such as Debian, Ubuntu, and their derivatives. It allows users to install, update, upgrade, and remove software packages from the system's repositories.

Basic Commands

Update Package List

Before installing or upgrading packages, you should update the package list to ensure you have the latest information about available packages:

sudo apt-get update

Upgrade Packages

To upgrade all installed packages to their latest versions, use:

sudo apt-get upgrade

To perform a more comprehensive upgrade that may install or remove packages to satisfy dependencies, use:

sudo apt-get dist-upgrade

Install a Package

To install a specific package, use:

sudo apt-get install package_name

For example, to install the curl package:

sudo apt-get install curl

Remove a Package

To remove a specific package, use:

sudo apt-get remove package_name

To remove a package along with its configuration files, use:

sudo apt-get purge package_name

Clean Up

To remove packages that were automatically installed to satisfy dependencies for other packages and are no longer needed:

sudo apt-get autoremove

To clean the local repository of retrieved package files:

sudo apt-get clean

To remove all packages that have been downloaded but are no longer installed:

sudo apt-get autoclean

Advanced Commands

Search for Packages

To search for a package by name or description:

apt-cache search keyword

Show Package Information

To display detailed information about a package:

apt-cache show package_name

Check for Broken Dependencies

To check for broken dependencies and attempt to fix them:

sudo apt-get check

Download a Package Without Installing

To download a package without installing it:

sudo apt-get download package_name

Upgrade the Distribution

To perform a distribution upgrade, which includes upgrading to a new release of the operating system:

sudo apt-get dist-upgrade

Example Usage

Update and Upgrade

To update the package list and upgrade all installed packages:

sudo apt-get update
sudo apt-get upgrade

Install Multiple Packages

To install multiple packages at once, list them separated by spaces:

sudo apt-get install package1 package2 package3

Remove Multiple Packages

To remove multiple packages at once:

sudo apt-get remove package1 package2 package3

Common Options

  • -y: Assume "yes" to all prompts and run non-interactively.
  • -f: Attempt to correct a system with broken dependencies.
  • --purge: Remove configuration files when removing packages.
  • -d: Download only; do not install or unpack archives.
  • --no-install-recommends: Do not consider recommended packages as a dependency for installing.

For example, to install a package without recommended packages:

sudo apt-get install --no-install-recommends package_name

Conclusion

The apt-get command is a versatile and essential tool for managing software packages on Debian-based systems. By understanding its basic and advanced commands, you can effectively install, update, upgrade, and remove packages, ensuring your system stays up-to-date and free of unnecessary software.

help

Usage: apt-get [options] command
       apt-get [options] install|remove pkg1 [pkg2 ...]
       apt-get [options] source pkg1 [pkg2 ...]

apt-get is a command line interface for retrieval of packages
and information about them from authenticated sources and
for installation, upgrade and removal of packages together
with their dependencies.

Most used commands:
  update - Retrieve new lists of packages
  upgrade - Perform an upgrade
  install - Install new packages (pkg is libc6 not libc6.deb)
  reinstall - Reinstall packages (pkg is libc6 not libc6.deb)
  remove - Remove packages
  purge - Remove packages and config files
  autoremove - Remove automatically all unused packages
  dist-upgrade - Distribution upgrade, see apt-get(8)
  dselect-upgrade - Follow dselect selections
  build-dep - Configure build-dependencies for source packages
  satisfy - Satisfy dependency strings
  clean - Erase downloaded archive files
  autoclean - Erase old downloaded archive files
  check - Verify that there are no broken dependencies
  source - Download source archives
  download - Download the binary package into the current directory
  changelog - Download and display the changelog for the given package