$man yum
NAME
yum - Yellowdog Updater Modified
SYNOPSIS
yum [options] [command] [package ...]
DESCRIPTION
yum is an interactive, automated update program which can be used for maintaining systems
using rpm
command is one of:
* install package1 [package2] [...]
* update [package1] [package2] [...]
* check-update
* upgrade [package1] [package2] [...]
* remove | erase package1 [package2] [...]
* list [...]
* info [...]
* provides | whatprovides feature1 [feature2] [...]
* clean [ packages | headers | metadata | cache | dbcache | all ]
* makecache
* groupinstall group1 [group2] [...]
* groupupdate group1 [group2] [...]
* grouplist
* groupremove group1 [group2] [...]
* groupinfo group1 [...]
* search string1 [string2] [...]
* generate-rss [updates]
Unless the --help or -h option is given, one of the above commands must be present.
<snip>