The Bourne Again Shell is the default command language / shell in Linux, and I've never bothered to try any other. You type stuff in (or paste it from stackexchange…) and useful stuff happens.

• https://askubuntu.com/questions/1107016/how-to-change-names-of-files-in-a-directory-to-random-generated-names

for file in *.jpeg; do
	mv -- "$file" "$RANDOM.jpeg"
done

for file in *.jpeg; do
	mv -- "$file" "$(mktemp --dry-run XXXXXXXX.jpeg)"
done

• Bash (Unix shell)
• GNU Bash - Homepage