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You can find the version information in /proc/version.
$ cat /proc/version
Linux version 6.8.0-53-generic (buildd@lcy02-amd64-046) (x86_64-linux-gnu-gcc-13 (Ubuntu 13.3.0-6ubuntu2~24.04) 13.3.0, GNU ld (GNU Binutils for Ubuntu) 2.42) #55-Ubuntu SMP PREEMPT_DYNAMIC Fri Jan 17 15:37:52 UTC 2025
In this case it is 6.8.0, with the distribution specific package version 6.8.0-53-generic.
Other methods to read the file (if cat is not available for some reason):
read version < /proc/version
echo $version
On some shells (e.g. bash, zsh) this will work:
echo $(</proc/version)
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uname, short for Unix Name, is part of GNU coreutils, and thus very likely already installed:
$ uname --kernel-release
6.13.3-arch1-1
It has some other potentially interesting flags too. Go and have a look at the docs.
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