How do I find my Unix OS version?

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How do I find my Unix OS version?
Answer
Check os version in Linux

1. Open the terminal application (bash shell)
2. For remote server login using the ssh: ssh
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3. Type any one of the following command to find os name and version in Linux: cat /etc/os-release. lsb_release -a. hostnamectl.
4. Type the following command to find Linux kernel version: uname -r.