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--- skill-tree:use:1:4:1:b [2020/06/07 18:28] – [Background] luciana
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-# USE1.4.1-B Overview
-# Background
-Understanding the general principles of a package manager is the foundation to utilize them.
-The package manager provides a repository of software stored in a dedicated file system location -- even for different versions.
-Specific software and version may depend on other software or libraries forming a tree of dependencies.
-The software might be incompatible with another software, too.
-The user can query available software via commands and load software using a program of the package manager via the shell command-line interface.
-A package manager then makes it available by manipulating shell variables.
-Understanding these variables is crucial to understand the system behavior and to debug issues.
-# Aim
-  * To describe the principles of a package manager and how it interfaces with the shell.
-# Outcomes
-  * Describe the general dependency structure of software
-  * Describe how a package manager makes software available
-  * Using the export command to print shell variables
-  * Understand shell variables relevant for executing software and for building software
-    - PATH for executables
-    - LD\_LIBRARY\_PATH for libraries
-    - MANPATH for manual pages (man command)
-    - PKG\_CONFIG\_PATH for pkg-config
-  * Manipulate shell variables to include additional software
-    - Setting shell variables for a single program by prefixing or by using export
-# Subskills