Linux Commands
Remove password protection from a PDF file:
qpdf --password=$PASSWORD --decrypt in.pdf out.pdf
Who’s using the soundcard:
fuser -v /dev/snd/* /dev/dsp*
Show progress on dd:
killall -SIGUSR1 dd
Resize logical volume to max free size:
lvresize -r -l +100%FREE /dev/my-vg/lvname