YUM (Yellowdog Updater, Modified) is an open-source command-line package-management utility for Linux operating systems using RPM packages.
Commands
Help & Listing Packages
yum help # Display yum commands and options
yum list available # List all available packages
yum list installed # List all installed packages
yum list kernel # List installed and available kernel packages
yum info vsftpd # List information about vsftpd package
Search & Dependencies
yum deplist nfs-utils # List dependencies for nfs-utils
yum provides "*bin/top" # Show package providing top command
yum search samba # Find packages matching samba in name or description
Updates & Security
yum updateinfo security # Get info on available security updates
yum update --security # Apply security-related package updates
Managing Repositories
yum repolist # Display enabled software repositories
yum repoinfo rhel-7-server-rpms # Display info on a specific repository
yum repo-pkgs my-rpms list # List packages from a specific repo
Installation & Removal
yum install vsftpd # Install the vsftpd package
yum update # Update all installed packages
yum downgrade abc # Downgrade package abc to an earlier version
yum autoremove httpd # Remove package httpd and unused dependencies
Package Groups
yum groupinstall "Web server" # Install Web Server group packages
Maintenance & History
yum history list # List all yum transactions
yum clean packages # Delete downloaded packages saved in cache
Common Flags
-y # Automatically answer yes to prompts
--disablerepo=epel # Temporarily disable a specific repository
--downloadonly # Download package to cache without installing