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These commands require FFmpeg and ImageMagick, available for both Windows and Linux. Convert an AVI to MP4 ffmpeg -i input.avi -c:v libx264 -crf 19 -preset slow -c:a aac -b:a 192k -ac 2 out.mp4 Auto orient, resize and change quality of an image convert -auto-orient input.jpg -resize 2048 -quality 80 output.jpg Convert a series of images into a video ffmpeg -pattern_type glob -i 'cam*.jpg' -c:v libx264 out.mp4

Get default target (runlevel) systemctl get-default List all targets (runlevels) systemctl --type=target Set default target (runlevel) systemctl set-default List all running services systemctl --type=service See service status systemctl status sshd Start service systemctl start sshd Enable service systemctl enable sshd Writing service scripts http://0pointer.de/blog/projects/systemd-for-admins-3.html Disable CTRL-ALT-DEL systemctl mask ctrl-alt-del.target systemctl daemon-reload