All about YUM ....
To install ‘xorg’ package, the syntax would be: # yum install ‘package name’
# yum install xorg
To uninstall ‘xorg’ package, the command would be: # yum remove ‘package name’
# yum remove xorg
To update ‘xorg’ package, the command would be: # yum update ‘package name’
yum update xorg-x11-filesystem
To have some fun with yum, try
yum list "*ssh*" # lists packages that have "ssh" in the name
chkconfig yum on # make yum update all programs every night
yum remove up2date # remove a program, dependencies handled
yum -y install curl # -y answers "yes" to all questions
N'joy,,,