uname -mrs

 Uname is very good tool for checking version of kernel. 

Sometimes customer need all output not only version of kernel. We can try uname -mrs. There is an output

[root@localhost ~]# uname -mrs

Linux 4.18.0-348.7.1.el8_5.x86_64 x86_64

you see: Linux + version of kernel + 64 bit OS 

Arcitle about command uname in Slovak language: https://zapiskylinuxadmina.blogspot.com/2020/02/prikaz-uname.html 

(I will translate to English in future)