I want to make updates to be executed inside a tmux-session to make the update process resilient against interrupted ssh-connections.

• update distribution packages on SUSE and Debian
• update git repositories
• update flatpak packages
• update snap packages

• https://how-to.dev/how-to-create-tmux-session-with-a-script
• https://www.golinuxcloud.com/tmux-commands/#Working_with_tmux_commands
• https://superuser.com/questions/863538/tmux-execute-command-in-session-on-startup
• https://www.peterdebelak.com/blog/tmux-scripting/
• https://www.gnu.org/software/coreutils/manual/html_node/install-invocation.html#install-invocation
• https://stackoverflow.com/questions/35707038/how-to-use-the-install-command-with-a-heredoc
• https://linuxhint.com/bash-heredoc-tutorial/
• https://www.cyberciti.biz/faq/using-heredoc-rediection-in-bash-shell-script-to-write-to-file/
• https://www.cyberciti.biz/faq/find-linux-distribution-name-version-number/

zypper in lsb-release

install -bD --owner=root --group=root --mode=0750 -T <(cat << 'EOF'
#!/bin/bash

# debug
set -x

declare _osvendor
declare _highlevelpackagemanager
declare _updatecommand

if [ ! command -v lsb-release >/dev/null 2>&1 ] && [ ! command -v lsb_release >/dev/null 2>&1 ] 
then 
    echo >&2 "ERROR: lsb-release required but it's not installed.  Aborting."
    exit 1;
fi

_osvendor="$( lsb-release -is )"


case $_osvendor in
    openSUSE)
        _highlevelpackagemanager="$( command -v zypper )"
        _updatecommand="${_highlevelpackagemanager} ref && ${_highlevelpackagemanager} dup -y"
        ;;
        
    Debian)
        _highlevelpackagemanager="$( command -v apt )"
        _updatecommand="${_highlevelpackagemanager} update && ${_highlevelpackagemanager} -y upgrade && ${_highlevelpackagemanager} -y full-upgrade"
        ;;

    *)
        echo >&2 "ERROR: Your operating system vendor (${_osvendor}) is not supported. Aborting."
        exit 1
        ;;
esac


tmux new -s sysupdate -d
tmux send-keys -t sysupdate "${_updatecommand}" C-m
tmux attach -t sysupdate
EOF
) /root/scripts/sysupdate/sysupdate

ln -s /root/scripts/sysupdate/sysupdate /root/bin/AAA

~~DISCUSSION~~