Here’s a neat little one liner for those managing linux servers to see how much free space they can free up from files related to previous kernels in the /boot folder.
ls -al /boot | grep -v $(uname -a | cut -d " " -f 3) | sed "s/ +/ /g" | grep - E "vmlinuz|symvers|initramfs|System.map|config-" | cut -d " " -f 5 | paste -sd+ | bc
and here’s another that tells you which files you can consider removing
ls -al /boot | grep -v $(uname -a | cut -d " " -f 3) | sed "s/ +/ /g" | grep -E "vmlinuz|symvers|initramfs|System.map|config-" | cut -d " " -f 9
Both use uname -a to get the current kernel version and then look for other files that don’t match (ie are related to previous kernels)
Use at your own risk.