How to Confirm Redhat Enterprise Linux Version

How to confirm RedHat Enterprise Linux version?

I assume that you've run yum upgrade. That will in general update you to the newest minor release.

Your main resources for determining the version are /etc/redhat_release and lsb_release -a

Determine Redhat Linux Version

If "anybody" has root access to your machine to either change /etc/redhat-release or install an alternate kernel you're most probably in bigger trouble than determining the redhat version of your system.

Just use the value pointed out by /etc/redhat-release or even better in terms of portability use the output of lsb_release as this is exactly the purpose they were made for.

With "anybody" being able to do anything with your system there is no other chance at all.

Get a specific Redhat version with regard to Kernel version

RHEL stands for Red Hat Enterprise Linux.

you can get the version and kernel details by uname command like the below example:

[hatem@localhost ~]$ uname -a

Linux localhost.localdomain 2.6.32-504.el6.x86_64 #1 SMP Wed Oct 15 04:27:16 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux

if you want to know what is the distribution is:

[hatem@localhost ~]$ cat /etc/issue

Red Hat Enterprise Linux Server release 6.5 (Santiago)

check if my OS release is CentOS or not

Check out /etc/issue to get additional branding/OS issue on RedHat based operating systems. This has been buggy in the past, so you can additionally check rpm -q centos-release or /etc/os-release.

Note that /etc/issue is meant to be read by the tty, so check out man agetty if you see lines like \S or Kernel \r on an \m and want to know what that means.

Santiago just is a release name for RHEL 6.2.

Finally, for even more information, check out lsb_release -a and you'll see lines for Distributor ID, and Description.

Linux version check Linux command or a Java code

Have you tried with?

cat /etc/*-release
cat /etc/redhat-release

or

cat /etc/issue

or

cat /proc/version

or even with

uname -a

Looking at Java documentation I see you can get few basic information about the operating system via System.getProperty(), I suppose you use Java Standard Edition 6.0. But very likely also other versions should return same infos.

• os.name Operating system name
• os.arch Operating system architecture
• os.version Operating system version

rhel os version detecting in makefile

In Makefiles, I prefer readability first, than performance or complex codes. Your version of code seems simple and fine. Just that multiple cut commands in your version, could be reduced into a single awk, as below.

OSVERSION = cat /etc/redhat-release | awk 'NF>1{print $NF}'
ifeq(OSVERSION,4)
   XXXXXXXXXXX
else
   YYYYYYYYYYY
endif

Besides, I would also like to point out that, /etc/redhat-release file is a reliable source of OS versions. But other commands do exist that do the similar:

$ uname -a
Linux local.net 3.5.3-1.fc17.i686 #1 SMP Wed Aug 22 18:25:58 UTC 2013 i686 i686 i386
GNU/Linux

$ cat /etc/issue
Red Hat Enterprise Linux Server release 5.5 (Tikanga)

$ /usr/bin/lsb_release --d
Description:    Red Hat Enterprise Linux Server release 5.5 (Tikanga)

How to check java version at linux (RedHat6)

To answer your question directly, you can use

rpm -qi java

OR

yum info "java"

For future Referenecs . You can try any of these commands.

rpm -qi "package_name_without_quotes"

It gives information of installed package. To display information about one or more packages (glob expressions are valid here as well), use the following command :

yum info "package_name_without quotes"

OR

yum list "package_name_without_quotes"

OR

yum --showduplicates list "package_name_without_quotes"

The yum info package_name command is similar to the rpm -q --info package_name command, but provides as additional information the ID of the Yum repository the RPM package is found in.

You can also query the Yum database for alternative and useful information about a package by using the following command :

yumdb info "package_name_without_quotes"

This command provides additional information about a package, including the check sum of the package (and algorithm used to produce it, such as SHA-256), the command given on the command line that was invoked to install the package (if any), and the reason that the package is installed on the system.

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