Usage of apt-get commands in ubuntu

Apt-get Command Introduction

Apt-get is a linux command, applicable to deb package-managed operating systems. It is mainly used to automatically search, install, upgrade, and uninstall software or operating systems from the software warehouse on the Internet.

Apt-get command usage

1. deb package installation:

Install the. deb package:

Code: sudo dpkg-I package_file.deb

Uninstalling the. deb package:

Code: sudo dpkg-r package_name

2. Installation using apt-get:
Install

Code: sudo apt-get install package_name

Reverse installation

Code: sudo apt-get remove package_name

Common apt-get commands

APT command parameters used:

Apt-cache search package

Apt-cache show package obtains package information, such as description, size, and version.

Sudo apt-get remove package Delete package

Sudo apt-get remove package--purge delete a package, including deleting a configuration file.

Sudo apt-get update source

Sudo apt-get upgrade updates installed packages

Sudo apt-get dist-upgrade system

Sudo apt-get dselect-upgrade using dselect

Apt-cache depends package for dependency usage

Apt-cache rdepends package is used to check which packages are dependent on this package.

Sudo apt-get build-dep package installation-related compilation environment

Apt-get source package download the source code of the package

Sudo apt-get clean & sudo apt-get autoclean clear useless packages

Sudo apt-get check whether any corrupted dependency exists

Sudo apt-get install package installation package

Sudo apt-get install package--reinstall re-installation package

Sudo apt-get-f install fix and install "-f = -- fix-missing"

Set http proxy for apt-get

You can set http proxy for apt-get in three ways.

Method 1

This is a temporary method. If you only need to use apt-get through http proxy temporarily, you can use this method.
Before using apt-get, enter the following command in the terminal (replace yourproxyaddress and proxyport according to your actual situation ).

The code is as follows:	Copy code
Export http_proxy = http: // yourproxyaddress: proxyport

Method 2

This method requires the apt. conf file in the/etc/apt/folder. If you want apt-get (instead of other applications) to always use http proxy, you can use this method.
Note: In some cases, the apt configuration file is not created during system installation. The following operations modify the existing configuration file or create a new configuration file as needed.

The code is as follows:	Copy code
Sudo gedit/etc/apt. conf

Add the following line to your apt. conf file (replace yourproxyaddress and proxyport according to your actual situation ).

The code is as follows:	Copy code
Acquire: http: Proxy "http: // yourproxyaddress: proxyport ";

Save the apt. conf file.

Method 3

This method adds two lines to the. bashrc file in your home directory. If you want apt-get and other applications such as wget to use http proxy, you can use this method.

The code is as follows:	Copy code
Gedit ~ /. Bashrc

Add the following content at the end of your. bashrc file (replace yourproxyaddress and proxyport according to your actual situation ).

The code is as follows:	Copy code
Http_proxy = http: // yourproxyaddress: proxyport Export http_proxy

Save the file. Close the current terminal and then open another terminal.
Use apt-get update or any network tool you want to use to test the proxy. I use firestarter to view active network connections.
If you modify the configuration file again to correct the error, close the terminal and open it again.