how to check patch level on linux redhat

Hi,

how to check patch level on linux redhat?  Thanks in advance
mokkanAsked:
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mhenry20Connect With a Mentor Commented:
For kernel level you can issue: uname -a
For package levels you can issue: rpm -q packagename  or rpm -qa|grep packstring

To see if a patch is available: up2date -l
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jeremycrussellCommented:
Additionally, to get release level:  cat /etc/redhat-release
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Mohan ShivaiahConnect With a Mentor Commented:
To find out RHEL versions
cat /etc/redhat-release".

To find the kernel version
uname -a
ex:
2.6.18-8.1.14.el5
2.6.18-92.1.22.el5

To determine specific package versions:
rpm -qa | grep -i <particular_rpm_base_package>
ex:rpm -qa | grep -i "JBoss"
JBoss-JMS-5.1.0-RHEL4.3.i386.rpm
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arnoldConnect With a Mentor Commented:
if you have yum as the package manager, you can run yum check-update.
It will return the list of packages you need to install to update your system or the various applications.
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Mohan ShivaiahConnect With a Mentor Commented:
You can to check patch level on linux redhat using YUM utility
YUM: Setup and Usage refer the below site its good one.
http://sial.org/howto/yum/
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