Change grub2 font-size

I searched and searched for the answer to the following question: «How do I change the font size in grub2?» It seems that no one on the entire Internet knew!

Well, I did a lot of digging into the grub2 documentation and the scripts bundled with Ubuntu and I finally have the answer!

1. Pick a font you want to use for your menu. I recommend a nice easy-to-read monospace font such as DejaVu Sans Mono (it's in the example below).
2. Convert the font to grub2's format using the grub-mkfont command, taking the extra step of setting the font size:

sudo grub-mkfont --output=/boot/grub/DejaVuSansMono.pf2 \
--size=24 /usr/share/fonts/truetype/ttf-dejavu/DejaVuSansMono.ttf

3. GRUB_FONT=/boot/grub/DejaVuSansMono.pf2


sudo update-grub

FYI: I believe the "--size=" indicates point size but I'm not entirely sure (the documentation doesn't say). If it is based on the point scale I don't believe it is taking dpi into account since I tried "--size=72" on a 120dpi display and letters were only about half an inch tall (72 points is precisely one inch).

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Backing up your mysql on linux box per each database

MYSQL="$(which mysql)"
MYSQLDUMP="$(which mysqldump)"
GZIP="$(which gzip)"
NOW=$(date +"%d_%m_%Y")
for i in `find $BAK -ctime +22`; do rm $i; done
[ ! -d $BAK ] && mkdir -p $BAK
DBS="$($MYSQL -u $MUSER -h $MHOST -p$MPASS -Bse 'show databases')"
for db in $DBS

it deletes every 22 days old backups if you want to change life-time,
you can change the value of ctime in the followed line: for i in `find $BAK -ctime +22`; do rm $i; done

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