There are several ways to find out which version of Red Hat Enterprise Linux (RHEL) you are running at the command line. Here are a few options:
Use the lsb_release command: This command displays information about the Linux distribution, including the version and codename. To use it, simply type lsb_release -a at the command prompt.
Use the uname command: This command displays information about the Linux kernel, including the version. To display the kernel version, use the -r option: uname -r.
Check the /etc/os-release file: This file contains information about the Linux distribution, including the version and codename. To view the contents of the file, use the cat command: cat /etc/os-release.
Check the /etc/redhat-release file: This file contains information about the Red Hat Enterprise Linux distribution, including the version. To view the contents of the file, use the cat command: cat /etc/redhat-release.
By using one of these methods, you should be able to find out which version of Red Hat Enterprise Linux you are running at the command line.
Note that Red Hat Enterprise Linux is also available in different "variants," such as Red Hat Enterprise Linux Workstation and Red Hat Enterprise Linux Server. To find out which variant you are running, you can use the cat command to view the contents of the /etc/variant-release file: cat /etc/variant-release.