Basic shell script to install && update the latest Thunderbird on Linux (specifically Ubuntu)

thunderbird-latest-update

#!/bin/bash
set -e

# Installation of this script:
#   Delete one of the url variables below, or get another from
#   https://www.thunderbird.net/thunderbird/all/
#   and substituting its version number with 'latest'
#   
url='https://download.mozilla.org/?product=thunderbird-latest-SSL&os=linux64&lang=en-US'
url='https://download.mozilla.org/?product=thunderbird-latest-SSL&os=linux64&lang=en-GB'
#
#   Then run:
#     sudo install thunderbird-latest-update /usr/local/sbin/
#
# Desktop integration:
#   save the accompanying .desktop file or adapt from
#   /usr/share/applications/thunderbird.desktop
#   into
#   /usr/share/applications/thunderbirdLatest.desktop
#   or ~/.local/share/applications/thunderbirdLatest.desktop
#
#   Change your default mail client application.


dir=/opt
subdir=thunderbird
bin="$dir/$subdir/thunderbird"
arcglob='thunderbird-*.tar.*'
arcre='\S+?(?=\.tar\.)'

help=0
delete=0
check=0
install=0
existing=0
while getopts ':hcdie' opt; do
	case $opt in
		h)
			help=1
			;;
		c)
			check=1
			;;
		d)
			delete=1
			;;
		i)
			install=1
			;;
		e)
			existing=1
			;;
		\?)
			>&2 echo "Unknown option $OPTARG."
			help=1
			;;
	esac
done
if ! (( help + delete + check + install )); then
	help=1
fi

if (( help )); then
	>&2 cat <<-EOT
		${0##*/} [ -h | -c | -i [ -d ] [ -e ] | -d [ -e ] ]

		Options:
		  -h  This help.
		  -c  Check for an update by viewing version numbers.
		  -i  Download and update/install, overwriting any previous install.
		  -d  Delete existing backup & archive files from previous attempts.
		      If combined with -ie, leaves the installation archive intact.
		  -e  Install/keep an existing downloaded archive.
		EOT
	exit
fi

if (( check )); then
	>&2 echo -n 'Remote: '
	wget --max-redirect=0 --method=HEAD --server-response "$url" 2>&1 > /dev/null | grep -Pio '^\s+Location:.*/\D+\K'"$arcre"
	if [[ -f "$bin" ]]; then
		>&2 echo -n 'Installed: '
		"$bin" -v | grep -Po '^\D*\K\S+'
	else
		>&2 echo Not installed.
	fi
	exit
fi

cd "$dir"

function readarcs {
	arcs=()
	readarray -t arcs < <(compgen -G "$arcglob" | sort -rV)
}

readarcs
if (( delete )); then
	if [[ -d "$subdir~/" ]] && ! rm -r "$subdir~/"; then
		>&2 echo "Could not remove backup dir $dir/$subdir~/"
		exit 1
	fi
	keep=0
	if (( existing )); then
		if [[ "${#arcs[@]}" -le 1 ]]; then
			keep=1
		else
			n=0
			for arc in "${arcs[@]}"; do
				n=$(( n + 1 ))
				>&2 echo "$n: $arc "`stat -c'%s' "$arc"`b
			done
			while ! (( keep )); do
				read -r -p 'Select archive to keep for installation: ' keep
				if ! [[ "$keep" =~ ^[1-9][0-9]*$ ]] || (( keep > n )); then
					>&2 echo Invalid selection. Ctrl + C to terminate.
					keep=0
				fi
			done
		fi
	fi
	n=0
	for arc in "${arcs[@]}"; do
		n=$(( n + 1 ))
		if [[ $keep -ne $n ]] && ! rm "$arc"; then
			>&2 echo "Could not remove archive $dir/$arc"
			exit 1
		fi
	done
elif (( install )); then
	if [[ -d "$subdir~/" ]] || [[ "${#arcs[@]}" -ge 2 ]] || { ! (( existing )) && [[ "${#arcs[@]}" -gt 0 ]]; }; then
		>&2 echo Delete files from previous install by adding the -d option.
		exit 1;
	fi
fi

if (( install )); then
	if ! (( existing )); then
		>&2 echo -n 'Downloading... '
		if ! wget -q --trust-server-names "$url"; then
			>&2 echo Failed.
			exit 1;
		fi
	fi
	readarcs
	if [[ "${#arcs[@]}" -ne 1 ]]; then
		>&2 echo No recognised installation archive.
		exit 1;
	fi
	arc="${arcs[0]}"
	>&2 echo -n 'Installing... '
	if { ! [[ -d "$subdir/" ]] || mv "$subdir/" "$subdir~/" ; } && \
		tar --no-same-owner -xf "$arc" --transform='s,^[^/]\+,'"$subdir,"
	then
		>&2 echo Done.
	else
		>&2 echo Failed.
		exit 1;
	fi
fi

thunderbirdLatest.desktop

[Desktop Entry]
Encoding=UTF-8
Name=Thunderbird Mail (latest)
Comment=Send and receive mail with Thunderbird
GenericName=Mail Client
Keywords=Email;E-mail;Newsgroup;Feed;RSS
Exec=/opt/thunderbird/thunderbird %u
Terminal=false
X-MultipleArgs=false
Type=Application
Icon=/opt/thunderbird/chrome/icons/default/default256.png
Categories=Application;Network;Email;
MimeType=x-scheme-handler/mailto;application/x-xpinstall;
StartupNotify=true
Actions=Compose;Contacts

[Desktop Action Compose]
Name=Compose New Message (latest)
Exec=/opt/thunderbird/thunderbird -compose
OnlyShowIn=Messaging Menu;Unity;

[Desktop Action Contacts]
Name=Contacts (latest)
Exec=/opt/thunderbird/thunderbird -addressbook
OnlyShowIn=Messaging Menu;Unity;

Quick start (nano is just to choose/set URL):

wget https://gist.github.com/Roy-Orbison/fde330edf17905d168516c75f57ae106/raw/55b48157f6c6430266bcd43740a09322e9415ee9/thunderbird-latest-update
nano thunderbird-latest-update
sudo install thunderbird-latest-update /usr/local/sbin/
sudo thunderbird-latest-update -i
sudo wget -P /usr/share/applications/ https://gist.github.com/Roy-Orbison/fde330edf17905d168516c75f57ae106/raw/55b48157f6c6430266bcd43740a09322e9415ee9/thunderbirdLatest.desktop