What does UL1 mean in Red Hat EL 6 (UL1+) or Oracle Linux 6 (UL1+)

What does UL 1+ mean?
UL stands for Update Level

1+ means all version numbers after and including 1, for example, 6.1, 6.2, 6.3... Refer Oracle Linux 6 Certification document. For example here is a typical Oracle certification matrix which refers to UL as in  Added certification support for OL 6 (UL 1+) & RHEL 6 UL1+ with OHS 11g ...

Output from /etc/redhat-release provides the OS distribution release. For example see below release with Update Level
RHEL Update 1 or UL1 stands for RHEL Server release 6.1 (Santiago)
RHEL Update 2 or UL2 stands for RHEL Server release 6.2 (Santiago)
RHEL Update 3 or UL3 stands for RHEL Server release 6.3 (Santiago) etc.

RHEL 6
# rpm –qf /etc/redhat-release
redhat-release-server-6Server-6.0.0.37
# cat /etc/redhat-release
Red Hat Enterprise Linux Server release
6.0 (Santiago)
RHEL 6 UPDATE 1
# rpm –qf /etc/redhat-release
redhat-release-server-6Server-6.1.0.2
# cat /etc/redhat-release
Red Hat Enterprise Linux Server release
6.1 (Santiago)
RHEL 6 UPDATE 2
# rpm –qf /etc/redhat-release
redhat-release-server-6Server-6.2.0.3
# cat /etc/redhat-release
Red Hat Enterprise Linux Server release
6.2 (Santiago)
RHEL 6 UPDATE 3
# rpm –qf /etc/redhat-release
redhat-release-server-6Server-6.3.0.3
# cat /etc/redhat-release
Red Hat Enterprise Linux Server release
6.3 (Santiago)
RHEL 6 UPDATE 4
# rpm –qf /etc/redhat-release
redhat-release-server-6Server-6.4.0.4
# cat /etc/redhat-release
Red Hat Enterprise Linux Server release
6.4 (Santiago)
RHEL 6 UPDATE 5
# rpm –qf /etc/redhat-release
redhat-release-server-6Server-6.5.0.1
# cat /etc/redhat-release
Red Hat Enterprise Linux Server release
6.5 (Santiago)
RHEL 6 UPDATE 6
# rpm –qf /etc/redhat-release
redhat-release-server-6Server-6.6.0.2
# cat /etc/redhat-release
Red Hat Enterprise Linux Server release
6.6 (Santiago)
RHEL 6 UPDATE 7
# rpm –qf /etc/redhat-release
redhat-release-server-6Server-6.7.0.3
# cat /etc/redhat-release
Red Hat Enterprise Linux Server release
6.7 (Santiago)
RHEL 6 UPDATE 8
# rpm –qf /etc/redhat-release
redhat-release-server-6Server-6.8.0.5
# cat /etc/redhat-release
Red Hat Enterprise Linux Server release
6.8 (Santiago)
RHEL 6 UPDATE 9
# rpm –qf /etc/redhat-release
redhat-release-server-6Server-6.9.0.4
# cat /etc/redhat-release
Red Hat Enterprise Linux Server release
6.9 (Santiago)


Same is with Oracle Linux as well. The only difference being Oracle includes additional file called as /etc/oracle-release which provides the Linux release number (Oracle has added its own text file, /etc/oracle-release, so support teams can easily identify that they obtained the code from Oracle)

ORACLE LINUX 6
# rpm –qf /etc/redhat-release
oraclelinux-release-6Server-0.0.5
# cat /etc/redhat-release
Red Hat Enterprise Linux Server release
6.0 (Santiago)
# cat /etc/oracle-release
Oracle Linux Server release 6.0

ORACLE LINUX 6 UPDATE 1
# rpm –qf /etc/redhat-release
oraclelinux-release-6Server-1.0.2
# cat /etc/redhat-release
Red Hat Enterprise Linux Server release
6.1 (Santiago)
# cat /etc/oracle-release
Oracle Linux Server release 6.1

ORACLE LINUX 6 UPDATE 2
# rpm –qf /etc/redhat-release
oraclelinux-release-6Server-2.0.2
# cat /etc/redhat-release
Red Hat Enterprise Linux Server release
6.2 (Santiago)
# cat /etc/oracle-release
Oracle Linux Server release 6.2

ORACLE LINUX 6 UPDATE 3
# rpm –qf /etc/redhat-release
oraclelinux-release-6Server-3.0.2
# cat /etc/redhat-release
Red Hat Enterprise Linux Server release
6.3 (Santiago)
# cat /etc/oracle-release
Oracle Linux Server release 6.3

ORACLE LINUX 6 UPDATE 4
# rpm –qf /etc/redhat-release
oraclelinux-release-6Server-4.0.4
# cat /etc/redhat-release
Red Hat Enterprise Linux Server release
6.4 (Santiago)
# cat /etc/oracle-release
Oracle Linux Server release 6.4
ORACLE LINUX 6 UPDATE  5
# rpm –qf /etc/redhat-release
oraclelinux-release-6Server-5.0.2
# cat /etc/redhat-release
Red Hat Enterprise Linux Server release
6.5 (Santiago)
# cat /etc/oracle-release
Oracle Linux Server release 6.5

ORACLE LINUX 6 UPDATE  6
# rpm –qf /etc/redhat-release
oraclelinux-release-6Server-6.0.2
# cat /etc/redhat-release
Red Hat Enterprise Linux Server release
6.6 (Santiago)
# cat /etc/oracle-release
Oracle Linux Server release 6.6

ORACLE LINUX 6 UPDATE  7
# rpm –qf /etc/redhat-release
oraclelinux-release-6Server-7.0.5
# cat /etc/redhat-release
Red Hat Enterprise Linux Server release
6.7 (Santiago)
# cat /etc/oracle-release
Oracle Linux Server release 6.7
ORACLE LINUX 6 UPDATE  8
# rpm –qf /etc/redhat-release
oraclelinux-release-6Server-8.0.3
# cat /etc/redhat-release
Red Hat Enterprise Linux Server release
6.8 (Santiago)
# cat /etc/oracle-release
Oracle Linux Server release 6.8

ORACLE LINUX 6 UPDATE  9
# rpm –qf /etc/redhat-release
oraclelinux-release-6Server-9.0.3
# cat /etc/redhat-release
Red Hat Enterprise Linux Server release
6.9 (Santiago)
# cat /etc/oracle-release
Oracle Linux Server release 6.9


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