Raspberry

raspi-config

Most settings can be modified via raspi-config

raspi-config

Black lines

/boot/config.txt

overscan_left=-40
overscan_right=-40
overscan_top=-40
overscan_bottom=-40

disable_overscan=1

Installed packages

nfs-utils                    
autofs
firefox
screen
vim-enhanced
htop
ntp
x11vnc
geeqie

omxplayer

ar vx /path/to/your/file.deb data.tar.gz 
tar xzf data.tar.gz -C / 
rm data.tar.gz

rename

/etc/hostname
/etc/hosts

temperatur

vcgencmd measure_temp

list content of package

dpkg-query -L <package_name>

which package contain file

dpkg --search /etc/bash_completion

is clock in sync

timedatectl