freeSpace.sh

#!/usr/bin/zsh

function myclean {
	## Show free space
	df -Th | grep -v fs
	# Will need English output for processing
	LANG=en_GB.UTF-8

	## Clean apt cache
	apt-get update
	apt-get -f install
	apt-get -y autoremove
	apt-get clean

	## Remove old versions of snap packages
	snap list --all | while read snapname ver rev trk pub notes; do
		if [[ $notes = *disabled* ]]; then
			snap remove "$snapname" --revision="$rev"
		fi
	done
	## Set snap versions retain settings
	if [[ $(snap get system refresh.retain) -ne 2 ]]; then snap set system refresh.retain=2; fi
	rm -f /var/lib/snapd/cache/*

	## Remove old versions of Linux Kernel
	# This one-liner is deprecated since 18.04
	# dpkg -l 'linux-*' | sed '/^ii/!d;/'"$(uname -r | sed "s/\(.*\)-\([^0-9]\+\)/\1/")"'/d;s/^[^ ]* [^ ]* \([^ ]*\).*/\1/;/[0-9]/!d' | xargs apt-get -y purge
	# New 2 lines to remove old kernels
	dpkg --list | grep 'linux-image' | awk '{ print $2 }' | sort -V | sed -n '/'"$(uname -r | sed "s/\([0-9.-]*\)-\([^0-9]\+\)/\1/")"'/q;p' | xargs apt-get -y purge
	dpkg --list | grep 'linux-headers' | awk '{ print $2 }' | sort -V | sed -n '/'"$(uname -r | sed "s/\([0-9.-]*\)-\([^0-9]\+\)/\1/")"'/q;p' | xargs apt-get -y purge

	## Rotate and delete old logs
	/etc/cron.daily/logrotate
	find /var/log -type f -iname *.gz -delete
	journalctl --rotate
	journalctl --vacuum-time=1s

	## Show free space
	df -Th | grep -v fs

	set -eu

	LANG=C snap list --all | awk '/disabled/{print $1, $3}' |
		while read snapname revision; do
			snap remove "$snapname" --revision="$revision"
		done

	dpkg -l 'linux-*' | sed '/^ii/!d;/'"$(uname -r | sed "s/\(.*\)-\([^0-9]\+\)/\1/")"'/d;s/^[^ ]* [^ ]* \([^ ]*\).*/\1/;/[0-9]/!d' | xargs sudo apt-get -y purge
}