Update Server is in:

/etc/sysconfig/rhn/up2date


The file /etc/sysconfig/rhn/systemid will be non empty if ever registered with rhn.

Show registered channels:

up2date —show-channels


To Register system on rhn:

up2date --register


Show updates:

up2date -l


Show available packages:

up2date --showall


Install updates:

up2date -u

add the f switch to force updates. Usually to update the kernel.

Install a new software or updates if already installed:

up2date packageName


List software groups:

up2date --show-groups


Install a software group:

up2date -i "@ Software group name"


Download all the packages:

|up2date --showall | xargs up2date --get|