Upgrade installed applications

apt-get update
apt-get upgrade

Upgrade system (kernel)

apt-get update
apt-get dist-upgrade

Upgrade to latest release

do-release-upgrade [-d]

Use -d for latest devel-release

Default character encoding in gnome-terminal

env LC_CTYPE=en_DK.ISO-8859-1 gnome-terminal

And/or use this, too - but I haven't investigated the difference, yet.
env LC_CTYPE=en_DK.ISO-8859-15 gnome-terminal

Also see https://bugs.launchpad.net/gnome-terminal/+bug/3923(external link)

Default size on gnome-terminal

gnome-terminal --geometry 160x48

Also see "man gnome-terminal"

Disable service auto start

In order to make a service NOT start on boot, do one of the following...

If the service is Upstart based (check with "status varnish")
echo 'manual' > /etc/init/varnish.override

If not, use the old fashion update-rc.d method:
update-rc.d varnish disable

Also see http://askubuntu.com/questions/19320/whats-the-recommended-way-to-enable-disable-services(external link)

How to add FiSH encryption to irssi

First, get this and unpack it:
https://github.com/falsovsky/FiSH-irssi(external link)

This has some prerequisites:
apt-get install build-essential dpkg-dev intltool-debian libglib2.0-dev libgmp3-dev libglib2.0-0 irssi-dev libssl-dev

Next, compile the thing and copy it in place:
./configure --with-irssi=/usr/include/irssi
cp src/.libs/libfish.so /usr/lib/irssi/modules/

Start irssi and load it like this: /load fish

How to get some perl addons working

apt-get install liblocal-lib-perl

Reboot while file system is read-only

# reboot -f
bash: /sbin/reboot: Input/output error

You get this if your file system had failed and goes into read-only mode.
You could try and remount it read/write but I think rebooting is better since a dirty file system will be checked in single user mode.

You can reboot forcefully like this:
echo 1 > /proc/sys/kernel/sysrq # Enable SysRq
echo b > /proc/sysrq-trigger # Reboot with no questions asked!

Reboot via crontab at 3:05 if the file /etc/reboot exists

0       3       *       *       *       if [ -f /etc/reboot ] ; then rm /etc/reboot && /sbin/shutdown -r +5 ; fi