Random Linux snippets

snippets.sh

# Get the amount of data written so far to the SSD /dev/sda (assumes a sector size of 512 byteas)
# 

sudo smartctl -a /dev/sda | grep Total_LBAs_Written | sed 's/.*[ \t]\([0-9]*\)$/\1 * 512/' | bc | numfmt --to=iec --suffix=B

# Proper turn off procedure for the HDD /dev/sdb
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sudo udisksctl unmount -b /dev/sdb
sudo udisksctl power-off -b /dev/sdb

# 7-Zip a folder and password protect files and file names.
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7z a /media/backup/stuff.7z ~/stuff/ -mhe=on -p

# Open a TrueCrypt volume (creates a new device in /dev/mapper for normal mounting)
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sudo cryptsetup --type tcrypt open /dev/sdb1 sdb1

# Create a PNG screenshot of X11 (including Xvfb)
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DISPLAY=:1 xwd -root -silent | convert xwd:- png:~/Pictures/screenshot.png

# Copy a file from a Docker image to host
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docker cp $(docker create --name foo <tag>):<file> <host-file> && docker rm foo