my-docs/Linux/LPIC1/3-package-managers.md

📦 Linux Libraries & Package Management

This guide provides a quick overview of library types, package sources, and Debian-based package management commands using apt.

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📚 Library Types

Linux supports two main types of libraries:

1. Static Libraries (.a)

   • Linked at compile-time
   • Included in the final binary
   • Larger file size, faster execution

2. Shared Libraries (.so)

   • Linked at run-time
   • Saved separately from the binary
   • Saves space and allows updates without recompiling

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📦 Package Sources

✅ Official Packages

Provided and maintained by the distribution (e.g., Debian, Ubuntu, Red Hat).

🌐 Third-Party Packages

Created by external developers or organizations. Use with caution and verify trustworthiness.

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🏬 Linux Package Managers

📦 Debian-based Systems

• Package Manager: apt
• Low-level Tool: dpkg
• Package Format: .deb

📦 Red Hat-based Systems

• Package Manager: yum or dnf (newer)
• Low-level Tool: rpm
• Package Format: .rpm

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🌍 Package Mirrors

Mirrors are alternative download sources for package repositories, often closer geographically for faster updates.

To sync with package mirrors and get the latest updates:

sudo apt update

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🔧 Common apt Commands

Command	Description
apt update	Refresh package lists
apt upgrade	Upgrade all installed packages
apt list	List packages
apt show <package>	Show details of a package
apt install <package>	Install a new package
apt reinstall <package>	Reinstall an existing package
apt remove <package>	Remove a package (keep config files)
apt purge <package>	Remove package and config files
apt-cache search <term>	Search for a package
apt autoremove	Remove unused dependencies

🔐 Use sudo before these commands when required.