====== Remove foreign fonts from Debian, Ubuntu and derivatives ======
To get rid of tons of asian, arabic, oriental fonts takes ages by hand.
This script I've made for my Debian 10, removes:
  * All non english fonts
  * All the Libreoffice help files except those indicated in the variable KEEP
  * All the Libreoffice locales except those indicated in the variable KEEP
  * All the Firefox locales except those indicated in the variable KEEP

This script frees around 1.4 GB and a lot of inodes, but most of all, when you have to choose a font it's a lot easier/faster.

<WRAP center round info 60%>
By default the script keeps en-gb + en-us + it.
Set the var KEEP to change it.
</WRAP>

<WRAP center round info 60%>
2/1/2023: v 1.1.0, the script also removes "fonts-teluguvijayam" (reported by Larator)
</WRAP>


<code bash purge-alien-loc.sh>
#!/bin/bash

# purge-alien-loc.sh - V. 1.1.0
# Remove oriental/medio-oriental/african/etc. fonts
#   + Libreoffice localization not of use in IT/GB/USA
#
# Author: Rik - www.riksoft.it
# Licence: LGPL
#
# Changelog
# 1.1.0 Added fonts-teluguvijayam

#--------- CONFIG ------------------------------

# localisations to keep (pipe separated)
KEEP="en-gb|en-us|it"

#-----------------------------------------------




sudo apt update

# Remove all oriental/arabic/asian fonts in Debian/Ubuntu/Mint

fonts="fonts-kacst fonts-kacst-one fonts-khmeros-core fonts-lklug-sinhala fonts-guru fonts-nanum fonts-noto-cjk"
fonts="$fonts fonts-takao-pgothic fonts-tibetan-machine fonts-guru-extra fonts-lao fonts-sil-padauk fonts-sil-abyssinica"
fonts="$fonts fonts-tlwg-* fonts-lohit-* fonts-beng fonts-beng-extra fonts-gargi fonts-gubbi fonts-gujr fonts-gujr-extra"
fonts="$fonts fonts-kalapi fonts-lohit-gujr fonts-samyak-* fonts-noto-unhinted fonts-noto-hinted fonts-navilu fonts-nakula"
fonts="$fonts fonts-orya-extra fonts-pagul fonts-sahadeva fonts-sarai fonts-smc fonts-telu-extra fonts-wqy-microhei"
fonts="$fonts fonts-hosny-amiri fonts-smc-anjalioldlipi fonts-sil-andika fonts-arphic-ukai fonts-arphic-uming"
fonts="$fonts fonts-sipa-arundina fonts-bpg-georgian fonts-khmeros fonts-smc-chilanka fonts-smc-* fonts-noto-ui-extra"
fonts="$fonts fonts-noto-ui-core fonts-noto-extra fonts-noto-core culmus fonts-ipafont fonts-ipafont-*"
fonts="$fonts fonts-farsiweb fonts-hosny-thabit fonts-ukij-uyghur fonts-yrsa-rasa fonts-sil-scheherazade"
fonts="$fonts fonts-unikurdweb fonts-dzongkha fonts-deva-extra fonts-teluguvijayam"

IFS=' ' read -ra aFonts <<< "$fonts"

for font in "${aFonts[@]}"; do
  sudo apt purge -y $font
done



#remove orphans/rubbish
sudo rm -r /usr/share/fonts/opentype/fonts-hosny-amiri \
/usr/share/fonts/truetype/andika \
/usr/share/fonts/truetype/arphic \
/usr/share/fonts/truetype/arundina \
/usr/share/fonts/truetype/fonts-bpg-georgian \
/usr/share/fonts/truetype/khmeros \
/usr/share/fonts/opentype/malayalam \
/usr/share/fonts/truetype/malayalam \
/usr/share/fonts/truetype/malayalam \
/usr/share/fonts/truetype/culmus \
/usr/share/fonts/opentype/ipafont-gothic \
/usr/share/fonts/opentype/ipafont-mincho \
/usr/share/fonts/truetype/farsiweb \
/usr/share/fonts/opentype/fonts-hosny-thabit \
/usr/share/fonts/truetype/fonts-ukij-uyghur \
/usr/share/fonts/truetype/fonts-yrsa-rasa \
/usr/share/fonts/truetype/scheherazade \
/usr/share/fonts/truetype/unikurdweb \
/usr/share/fonts/truetype/dzongkha \
/usr/share/fonts/truetype/fonts-deva-extra \
/usr/share/doc/fonts-teluguvijayam \
/usr/share/fonts/truetype/teluguvijayam


echo "==== Fixing font cache"
sudo fc-cache -f -v && sudo dpkg-reconfigure fontconfig

echo "==== Packages left (each containing multiple fonts)"
sudo dpkg -l fonts\*|grep ^ii|awk '{print $2}'




echo
echo "We are going to remove Libreoffice Help in any language except $KEEP"
read -p "Press CTRL+C to interrupt, return to continue."

#unfortunately this one-liner cannot be used :-(
#because bash doesn't support lookahead
#sudo apt purge '^libreoffice-help-(?!it|en)[a-z]{2}(-[a-z]{2})?$'
#... so... I'll go this way
#sudo apt purge '^libreoffice-help-[a-z]{2,3}(-[a-z]{2})?$'
#sudo apt install libreoffice-help-en-gb libreoffice-help-en-us libreoffice-help-it
#or more cleaner/secure as follows...

list=$(sudo dpkg --get-selections | cut -f1 | grep -E '^libreoffice-help-[a-z]{2,3}(-[a-z]{2})?$')
for pkg in $list; do
	if [[ "$pkg" =~ ^(libreoffice-help-($KEEP))$ ]]; then
		echo "Skipping $pkg"
	else
		sudo apt purge -y "$pkg"
	fi
done




echo
echo "We are going to remove Libreoffice locales except $KEEP"
read -p "Press CTRL+C to interrupt, return to continue."

#sudo apt remove '^libreoffice-l10n-[a-z]{2,3}(-[a-z]{2})?$'
#sudo apt install libreoffice-l10n-en-gb libreoffice-l10n-it
#Safer as follows...

list=$(sudo dpkg --get-selections | cut -f1 | grep -E '^libreoffice-l10n-[a-z]{2,3}(-[a-z]{2})?$')
for pkg in $list; do
	if [[ "$pkg" =~ ^(libreoffice-l10n-($KEEP))$ ]]; then
		echo "Skipping $pkg"
	else
		sudo apt purge -y "$pkg"
	fi
done





echo
echo "Firefox is bound to Libreoffice locales so apt will"
echo "cope installing the missing locales for Firefox."
echo "We are going to remove them as well, except for $KEEP."
read -p "Press CTRL+C to interrupt, return to continue."

#sudo apt remove '^firefox-esr-l10n-[a-z]{2,3}(-[a-z]{2})?$'
#sudo apt install firefox-esr-l10n-en-gb firefox-esr-l10n-it
#Safer as follows...

list=$(sudo dpkg --get-selections | cut -f1 | grep -E '^firefox-esr-l10n-[a-z]{2,3}(-[a-z]{2})?$')
for pkg in $list; do
	if [[ "$pkg" =~ ^(firefox-esr-l10n-($KEEP))$ ]]; then
		echo "Skipping $pkg"
	else
		sudo apt purge -y "$pkg"
	fi
done



# This could be implemented as well, leaving only the interested languages...
#task-*-desktop


sudo apt autoremove

read -p "Press any key to close."
</code>