How to install the apt-get command on ubuntu linux Server

Some Usage of the apt-get command for installing software on ubuntu linux Server-Linux Enterprise Application-Linux server application information. The following is a detailed description. How to directly find the software you want to install under ubuntu. For example, I want to install tomcat. however, I don't know which version is in ubuntu or what I need to install, but I can confirm that I have installed tomcat, so I can use the search command: for example: $ apt-cache search tomcat then I will get the following results: libtomcat5-java-Java Servlet engine -- core libraries
Tomcat5-Java Servlet 2.4 engine with JSP 2.0 support
Tomcat5-admin-Java Servlet engine -- admin web interfaces
Tomcat5-webapps-Java Servlet engine -- documentation and example web applications
In this way, I know that ubuntu's software library contains Tomcat 5, so I can use $ apt-get install tomcat5 to install APT from Debian GNU/Linux, in the same version number, Debian is divided into seconds according to the kit maturity.
Table, testing, and unstable.

If we use Debina 3.0r2 stable, use apt-get upgrade.

You can upgrade the software for stable, and use apt-get dist-upgrade to select
Upgrade from stable to testing or unstable,

The results of apt-get upgrade and apt-get dist-upgrade are basically the same,
Apt-get dist-upgrade will install a new suite for dependency while upgrading, While apt-g
Et upgrade does not exist. Therefore, it is recommended that you use apt-get dist-upgrade for upgrade.

Apt-cache search

Search: we can use this command to search for upgrade packages,

Example: apt-cache search httpd,

Apt-cache depends

Dependency: we can use this command to view all dependency files of the software package,

For example: apt-cache depends httpd,

Apt-get install

Install: install the software package,

For example: apt-get install httpd, so that apt will automatically download httpd from the Internet and then install it. If
When httpd has dependency suites, apt will automatically download and install

Apt-get clean

Clear: when the apt-get install command is used to install the package, the downloaded rpm will be placed in/var/
Cache/apt/archives, which can be cleared using the apt-get clean command to avoid occupying hard disk space


Apt-get remove

Remove: for example: apt-get remove httpd, httpd will be removed. If there is a dependency suite
And apt will also be removed.

These commands should be enough. To get further instructions, please use man :)

Apt-get update

Update: this command is used to obtain the suite of remote servers recorded in/etc/apt/sources. list.
Before using the "apt-get dist-upgrade" command to upgrade the suite, remember to use this
Command to update the suite file list

Apt-get dist-upgrade

Upgrade: the upgrade here is mainly based on the existing software package updates, not to update the entire system.

You can also use the newly established package manager on the GUI :)

If the manager is not installed, run the following command:

Apt-get install synaptic

After the installation is complete, you can directly press synaptic on the command line to start it.