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Exactly. You don't need a GUI remotely because you have one at your desktop already. What i like to do is to have xterms with the ssh-calls for certain important server/user combinations predefined....

Just open a terminal window, type ssh user@host and you are there. My "desktop" used to administrate ~500 servers is exactly that: lots of xterms with ssh-sessions in them (and an occasional Firefox...

I wonder if /etc/cron.hourly/ is a magic place where executables are run once an hour by root without a crontab entry - and without arguments.
If you have a crontab entry they are run twice...
BTW...

As has been said MANY times before, cron doesn't create the same environment that you get when you login. And, there is nothing in your script that attempts to set variables that are needed in your...

array_save()
{
eval "printf '%s\n' \"\${${x}[@]}\""
} > "${2:-/dev/tty}"