Share your useful shell scripts

file=$(aria2c `xclip -o` --seed-time 0 -d /tmp | python -c "import re,sys; print(re.findall(r'complete: (/.*)\n',''.join(l for l in sys.stdin))[-1])"); mpv $file && rm -r $file

// looking for the defined block device name... or "ARE YOU STILL THERE? (Portal reference)
status=$(mount | grep "nbd4p2")

// checking the status by counting the number of characters stored in the variable
if [ ${#status} = 0 ] 
then

// setting up the maximum number of block device...
sudo modprobe nbd max_part=8

// attaching the image as a block device
sudo qemu-nbd --connect=/dev/nbd4 /media/sdc/virt-machine/libelec.qcow2

// in order to prevent too fast command executions... it can be a problem, I've been there ^^"
sleep 0.5

// make a dir for the mount command
mkdir /media/libelec 

// take a half second break... again your shell script will appreciate it
sleep 0.5 

// attach me, please :)
sudo mount /dev/nbd4p2 /media/libelec

// reversing everything, unload stuff
else
sudo umount /media/libelec
rmdir /media/libelec
sudo qemu-nbd --disconnect /dev/nbd4
sudo rmmod nbd
fi

// if exists it will store the string for further analysis
dpon=$(xrandr --listactivemonitors | grep "DP1-1")
hdon=$(xrandr --listactivemonitors | grep "HDMI1")

// because I used [b]#[/b] it will count the number of characters
// if it doesn't zero then...
if [ ${#dpon} != 0 ] || [ ${#hdon} != 0 ]
then
// turn off HDMI1 and DP1-1 and switch on DP1-2 in 1920x1080
xrandr --output HDMI1 --off
xrandr --output DP1-1 --off
xrandr --output DP1-2 --mode 1920x1080

else
// otherwise turn on DP1-1 as a primary monitor in the those specified coordinates in pixels
// and put HDMI1 in the left in those coordinates
xrandr --output DP1-1 --auto --pos 0x175 --output HDMI1 --auto --primary --pos 1680x0
xrandr --output DP1-2 --off
fi

// locking the screen
cinnamon-screensaver-command -l
// turning off screen until mouse or keyboard input 
xset dpms force off

for i in *.wav; do ffmpeg -i "$i" "${i%.*}.mp3"; done

rename -n 's/\-cr.mp3/\.mp3/' *.mp3

:bulkrename