特殊:Badtitle/NS100:SoftwarePackagingFormats

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Introduction

In this document we summarise major Linux package formats. Windows users may be aided by comparing them to the Windows formats they are familiar with.

Objective

This document is made for users who are new to Linux and want to know about the Linux package formats. This guide will cover some known package formats, compressions, and methods of packaging.

Formats

In Windows, software come usually in .zip, .rar, or .exe format. For Linux you have options like:

• Source files

• Binary files

• Tarballs

• Redhat packages (.RPM)

• Debian Packages (.deb)

Source files are nothing but raw code which requires compilation to work, while binary files are like .exe files which are ready to install.

Tarballs

Tarballs are a large collection of files compatted into a single archive file. The "tar" command is used to combine many files into a single file for archiving or easy distribution. The "gzip" command is used to compress the size of a file so that it takes up less space. A tarball is very similar to a WinZip file on Windows or an HQX file on Macs.

Tarballs have extensions like ".tar.gz", ".tar.bz2" or "TGZ". Most of the time, a tarball contains source files and/or binary files. In the open source community, they are used to distribute source code. If you find any software with a .tar.gz appendix, you will need to uncompress it by double clicking on it before installing the software it contains. To do the same thing from a terminal window, you can also use the tar command like this: tar xzf name_of_file

gzip

The most common method of file compression in linux is to use the gzip program. Gzip will compress any kind of file, but works best on text files (such as source code files).

You can use these command line options.

To compress an individual file using gzip:

gzip filename

To uncompress an individual gzipped file:

gunzip filename.gz

To create a gzipped tar file:

tar cvzf archivename.tar filename

To extract specific files from a gzipped tar file:

tar xvzf archivename.tar filenames

A warning for novice users: don't use directly tarballs; if there are .deb packages available you should use them as you might damage or destabilise your installation.

RPM's

The Red hat Package Manager or .RPM format is specifically designed for easy installation and management of software packages. The format allows you to automatically install, upgrade and remove software packages. It tracks dependencies -- situations where one package requires another package in order to work correctly -- and will not install software if it depends on another package which is not installed.

To convert RPM packages to debian package format you can use the alien command. A warning for novice users: don't use the alien method; if there are .deb packages available you should use them as you might damage or destabilise your installation.

deb packages

Debian, along with its derivative distributions, uses packages in a file format called deb. Deb packages are managed using a command line program called "dpkg", or with graphical front ends for dpkg like synaptic, adept, etc. Deb packages are known for their adaptability and robustness.

As Ubuntu is based on Debian, it uses the .deb packages system. The software technology for the download and automatic installation of packages is known as "apt". You will find these commands helpful for .deb files:

To install a package:

dpkg -i packagename

To list installed packages:

apt-cache show packagename

To remove/uninstall a package :

dpkg -r packagename

If you are not a command line user, you may wish to use Synaptic to perform these functions. All these commands requires root privileges.

Programs, packages, help resources

Software installation programs available for Ubuntu/Kubuntu are Synaptic Package Manager and Adept. You can even use Add-Remove applications link from applications menu to add or remove softwares. Besides the Ubuntu repositories you can obtain software from various sources. Some of the sources/links are mentioned below.

• http://www.linuxapps.com
• http://www.icewalkers.com
• http://packages.debian.org/
• http://www.apt-get.org/

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