How to list or check installed Linux kernels using command line

To list or check the installed Linux kernels on a system using the command line, you can use the ls command to list the files in the /boot directory, or the uname command to display the currently running kernel version.

1. To list the installed Linux kernels, use the ls command to list the files in the /boot directory:

ls /boot

The output will list the files in the /boot directory, including the Linux kernel image files (usually named vmlinuz-*).

2. To check the currently running kernel version, use the uname command with the -r option:

uname -r

The output will display the version of the currently running kernel.

For example:

$ ls /boot
config-4.19.0-9-amd64  initrd.img-4.19.0-12-amd64  System.map-4.19.0-9-amd64  vmlinuz-4.19.0-12-amd64
config-4.19.0-9-amd64.dpkg-bak  initrd.img-4.19.0-9-amd64  System.map-4.19.0-12-amd64  vmlinuz-4.19.0-9-amd64
config-4.19.0-12-amd64  initrd.img-4.19.0-9-amd64.old  System.map-4.19.0-9-amd64.dpkg-bak  vmlinuz-4.19.0-9-amd64.old

$ uname -r
4.19.0-12