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Baby > Kompost > LINQ > Lambda > TheLambdaPapers > LambdaTheUltimate > LanguageComparisons > LanguageFights > LanguageComplexity > LanguageOrientedProgramming > LanguageWars > LanguageFights > LarryWall > Leiningen > LessCode > LexerAndParser > LinuxClear TrailSudo (su "do") allows a system administrator to delegate authority to give certain users (or groups of users) the ability to run some (or all) commands as root or another user while providing an audit trail of the commands and their arguments.[2]
The Advanced packaging tool, or APT, is a user interface that works with core libraries to handle the sometimes difficult process of installing software on Linux. APT simplifies the process of managing software on Unix-like computer systems by automating the retrieval, configuration and installation of software packages, either from binary files or by compiling source code.
APT relies on the concept of repositories in order to find software and resolve dependencies. For apt, a repository is a directory containing packages along with an index file.
Under Linux, the package for the program you're interested in only contains the actual program itself. Any library files it needs must be supplied separately, courtesy of other packages. This is why it's unusual to download a single package installation file when running Linux, and it's why elaborate systems are in place to aid software installation. These systems help take care of the library files by ensuring they're downloaded and/or installed at the same time (presuming, of course, that they're not already present on the system, as they often are).
This system is called (for obvious reasons) dependency management. The whole system of package installation is usually called package management.[4]